Archives of Environmental & Occupational Health, Vol. 64, Suppl. 1, 2009 C 2009 Derek R. Smith Copyright
Highly Cited Articles in Environmental and Occupational Health, 1919–1960 Derek R. Smith, PhD, DrMedSc, MPH
ABSTRACT. Although numerous lists of “citation classics” have been compiled across a variety of scientific fields, few have included articles from environmental and occupational health (EOH). This investigation sought to identify and analyze the most highly cited articles ever published in the Journal of Industrial Hygiene (1919–1935), the Journal of Industrial Hygiene and Toxicology (1936–1949), the Archives of Industrial Hygiene and Occupational Medicine (1950), the American Medical Association (A.M.A.) Archives of Industrial Hygiene and Occupational Medicine (1950–1954), and the A.M.A. Archives of Industrial Health (1955–1960). Regularly cited topics included metal fume fever and various studies of beryllium, whereas the most highly cited article of all was a 1957 paper describing the control of heat casualties at military training centers. Interestingly, the most highly cited articles were not the oldest, and nor were they written as literature reviews. Overall, this study suggests that although some citation patterns in EOH reflect those of other disciplines, the trend is not uniform and EOH itself appears to have some distinctive bibliometric characteristics. KEYWORDS: citation classics, environmental health, highly cited articles, occupational health, publishing
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apid advances in computing power, increased communication via the Internet, and a contemporary academic obsession with bibliometric indicators have all ensured that the field of citation indexing has expanded dramatically in recent years. Counting the number of times that an individual article, author, or journal has been cited by others, and who has been cited more than who, now represents one of the largest subdisciplines of bibliometrics.1 Increasing academic interest, and perhaps general curiosity, has also been focused on papers in a particular journal or field that have attracted an unusually high proportion of all citations, the so called highly cited articles. Another term commonly used to describe the same thing, citation classics, was coined by Eugene Garfield in the late 1970s.2 Garfield had earlier proposed the concept of an impact factor in 1955,3 and founded the Institute for Scientific Information (ISI) in 1958.4 One of its core products was a database of scientific
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articles known as the Science Citation Index (SCI ), which was first published in 1961.5 Having such a large database of published articles and their reference lists made it possible to recognise various citation-based phenomena that were occurring in the journal literature. By the late 1960s, computers had made it easier to search through large databases such as those created by Garfield, and therefore, to establish which scientific papers were being highly cited. In one of the first studies published in 1971, Garfield compiled a list of the 50 most-cited articles from 1967.6 This was followed by a list of the 50 most-cited articles from 1961 to 1972,7 a list of classic papers from the late 19th and early 20th centuries,8 and a paper describing the most highly cited articles, ever.9 Being founder and director of the ISI allowed unlimited access to the company databases, and as such, much of the early work on highly cited papers during this period continued to be written by Garfield
Derek R. Smith is Professor of Environmental and Occupational Health, and Director of the WorkCover NSW Research Centre of Excellence, University of Newcastle, Ourimbah, New South Wales, Australia.
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himself.10 Lists of citation classics focused on individual journals such as the Lancet,11 the New England Journal of Medicine,12 Annals of Internal Medicine,13 and the Journal of the American Medical Association,14 as well as in broad scientific fields ranging from “anthropology to urban studies.”15 Academic curiosity was evidently stimulated by Garfield’s articles, and by the 1980s, other authors had started publishing lists of highly cited articles in various fields.16 There has also been a certain amount of overlap between disciplines. Casey,17 for example, investigated the influence of American and British journals on medical progress. Interestingly, his analysis did include an environmental and occupational health (EOH) journal, the Journal of Industrial Hygiene. A comprehensive historical review of early citation analysis in the broader sphere of “health science” was published some time later.18 By the 1980s, investigations by scholars other than Garfield began to emerge. One of the earliest appears to have focused on the journal Fertility and Sterility, which included a list of citation classics in 198719 and later in 2006.20 In 1988, a list of citation classics was published for the Archives of Physical Medicine and Rehabilitation,21 followed by the American Journal of Hospital Pharmacy in 198922 and the Journal of Investigative Dermatology in the same year.23 In 1990, citation classics in the Journal of Laboratory and Clinical Medicine were also identified.24 Possibly due to the fact that much of the early work was published by Garfield himself, most of the early compilations of citation classics utilized the ISI database. Even so, then as now, the identification and publication of citation classics within a particular journal or speciality relies heavily on the motivations and interests of authors who write for it. Certain fields have attracted more attention from the “citation counters” than others, however, with dermatology for example, having many such lists.25–30 General medicine has not been neglected in recent years either, with citation classics and highly cited authors in general medical journals,31 surgical journals,32 as well as speciality fields such as peritoneal dialysis.33 Journals in newly emerging speciality areas have also published lists of classics in recent years, including the Journal of Analytical Toxicology,34 the Journal of Pediatric Orthopaedics,35 and Plastic and Reconstructive Surgery,36 to name a few. Despite this seeming proliferation of articles describing their highly cited cousins, relatively few authors have specifically looked at top-cited papers in the journals of environmental and occupational health (EOH). This is despite over 100 years of EOH journals being published across a variety of countries.37 As readers may know, the Archives of Environmental & Occupational Health (AEOH) has a long and distinguished history that has so far involved a total of 7 different names since 1919.38 Briefly, the AEOH’s earliest ancestors can be traced to foundation of the Journal of Industrial Hygiene (JIH) by the US Industrial Medical Association (IMA) in 1919. The JIH would publish issues until 1935, after which time it was continued as a succession of periodicals known as the Journal of Industrial Hygiene and 2009, Vol. 64, Suppl. 1
Toxicology (JIHT) (published between 1936 and 1949), the Archives of Industrial Hygiene and Occupational Medicine (AIHOM) (published in 1950), the American Medical Association (A.M.A.) Archives of Industrial Hygiene and Occupational Medicine (AMA-AIHOM) (published between 1950 and 1954), the A.M.A. Archives of Industrial Health (AMA-AIH) (published between 1955 and 1960), and perhaps its most famous incarnation, the Archives of Environmental Health (published between 1960 and 2004). Since 2005, the journal has been known as the Archives of Environmental & Occupational Health. Due to the breadth of material published by this journal and its predecessors over the past 90 years, the current article focuses on highly cited papers published in its first 5 incarnations between 1919 and 1960. A detailed citation analysis of the sixth and longest running version of the journal, the Archives of Environmental Health (AEH), is described elsewhere.39 METHODS Establishing citation counts for articles up to 90 years old incurs numerous technical challenges, not the least of which is the fact that it involves a time before digital archives, personal computers, and citation indexing existed. As such, it is often difficult to find electronic records, and sometimes even printed versions, of articles published in the earliest journals. Searching for citations themselves, particularly older ones, often leads to the discovery of citation errors and misquoting, which can seriously thwart the ability of search engines to properly count the true number of citations received. Citations themselves are not always accurate,40 and incomplete citations are known to represent a major source of bibliographic chaos.41 When preparing for the current analysis, numerous errors were found relating to journal names. Some of the older incarnations of the journal do not appear to be listed in the usual bibliometric databases, with many citations having to be extracted from the reference lists of published articles. When searching in this manner, it was also ascertained that many reference lists compiled by authors have evidently used incorrect or incomplete journal names. It is worth noting that uniform requirements for manuscripts submitted to biomedical journals were not introduced until the late 1970s.42 Another source of confusion for authors may relate to the fact that although the journal changed its name many times, the names themselves remained somewhat similar. For example, in 1936 the only change was the addition of the words “and Toxicology,” whereas in 1950 the “AMA” prefix was added. The term AMA itself has also appeared in reference lists in many different variations, such as “AMA” (without periods), “A.M.A.” (with periods), or even the full words: “American Medical Association.” Similarly, misspelled author names also added another layer of complexity when searching for citations. At least one highly cited article had been cited in different publications with different first authors. Although citations errors such as this can be reduced 33
to some extent,43 there is still work to be done to prevent them altogether.44 With these limitations in mind, the next issue is to decide which search engine one should actually use. Possibly due to the fact that all of the early citation classics identified by Garfield had been extracted from the ISI databases, much of the later work published by other authors also appears to have utilized this system (nowadays known as the R Thomson Reuters Web of Science database).45 Competitors have emerged in recent years, however, with Google Scholar and Scopus being 2 examples, each with its own strengths and weaknesses.46,47 How these intrinsic differences in search engines actually affect the end result when searching for citations depends heavily on what one will define as a “valid” citation. That is, was the article in question cited by an international academic journal or a well-known book, or, was it cited in a conference abstract, a thesis, an unpublished report, or elsewhere? The different search engines mentioned above all detect citations in different ways, and according to Bakkalbasi and colleagues,46 none of them in isolation is the answer to all citation tracking needs, although all three can certainly retrieve some interesting material. Nevertheless, there are various reasons for using the Scopus database exclusively in the current study. Firstly, it has been shown that Scopus can be used as the sole data source for citation-based research in certain fields,48 including EOH.49 Secondly, aside from having a relatively large database of source journals, Scopus also tracks articles in the reference lists of others. This makes it very useful for identifying very old references from old journals that are not included on the ISI journal list. Thirdly, although other Internet-wide search engines such as Google Scholar may be useful for identifying “grey literature” (ie, older, nonlisted journals), this method is known to be very time-consuming when compared to some of the more scientifically orientated databases.50 As a result, the current study was undertaken using the Scopus database. To keep the results to a manageable level, however, only the top 5 most highly cited articles from each periodical title were sought.
The main searches were undertaken on Scopus during 2009 using the “Source Title” selection in a “Basic Search.” Multiple searches were then performed to account for each potential name variation for each incarnation of the journal. Searches targeted, for example, the “Journal of Industrial Hygiene,” “J Industrial Hygiene,” “J Ind Hygiene,” “J Industrial Hyg,” “J Ind Hyg,” and so on. Later version of the journal which included the “AMA” prefix were searched in similar ways, using variations such as “AMA” (without periods), “A.M.A.” (with periods), or even the full words: “American Medical Association.” All searches were manually examined and refined by limiting output to the specific journals of interest. This was achieved by using the “Refine Results” feature for “Source Title” (to establish if it was a journal of interest) and “Year” (was the journal of interest actually published in this particular year). Following extensive refinement in this manner, a list of the top 5 most highly cited articles for each journal was obtained. RESULTS
Journal of Industrial Hygiene (1919–1935) Highly cited articles from the JIH are displayed in Table 1.51–55 Two of the most highly cited articles in this list described metal fume fever. The first, by Drinker, Thomson, and Finn51 focused on the resistance acquired by inhalation of zinc oxide on 2 successive days. In their article, the authors describe how pronounced leukocytosis accompanied metal fume fever among 2 healthy, male subjects, although by the day after their second exposure, both were free from symptoms and felt themselves to be in normal health.51 These articles were evidently part of a series on metal fume fever, with Part I being published by Sturgis and Thompson in the JIH during 1927,56 and Parts III and V being published by Drinker and colleagues in the same journal during 192757 and 1928,58 respectively. The second article on this topic, also by Drinker, Thomson, and Finn,55 describes threshold doses of zinc oxide, preventive measures, and the chronic effects of repeated exposures, with regard to metal fume fever.
Table 1.—-Highly Cited Articles From the Journal of Industrial Hygiene (1919–1935)∗ Rank 1
Drinker P, Thomson RM, Finn JL.51
2
Edsall DL, Wilbur FP, Drinker CK.52
3 4 5
Haggard HW.53 Bulmer FM, Mackenzie EA.54 Drinker P, Thomson RM, Finn JL.55
∗ As
34
Author(s)
Title of Article
Year
Volume
Pages
Metal fume fever: II. Resistance acquired by inhalation of zinc oxide on two successive days. The occurrence, course and prevention of chronic manganese poisoning. The toxicology of hydrogen sulphide. Studies in the control and treatment of “Nickel Rash.” Metal fume fever: IV. Threshold doses of zinc oxide, preventive measures, and the chronic effects of repeated exposures.
1927
9
98–105
1919
1
183–193
1925 1926 1927
7 8 9
113–121 517–527 331–345
identified by Scopus. Archives of Environmental & Occupational Health
Table 2.—-Highly Cited Articles from the Journal of Industrial Hygiene and Toxicology (1936–1949)∗ Rank
Author(s)
1
Hardy HL, Tabershaw IR.59
2
Hueper WC, Wiley FH, Wolfe HD.60
3
Deichmann WB, LeBlanc TJ.61
4
Levine L, Fahy JP.62
5
Eisenbud M, Wanta RC, Dustan C, et al.63
∗ As
Title of Article Delayed chemical pneumonitis occurring in workers exposed to beryllium compounds. Experimental production of bladder tumors in dogs by administration of beta-naphthylamine. Determination of the approximate lethal dose with about six animals. Evaluation of urinary lead concentrations. I. The significance of the specific gravity. Non-occupational berylliosis.
Year
Volume
Pages
1946
28
197–211
1938
20
46–84
1943
25
415–417
1945
27
217–223
1949
31
282–294
identified by Scopus.
Journal of Industrial Hygiene and Toxicology (1936–1949) Highly cited articles from the second incarnation, the JIHT, are displayed in Table 2.59–63 Similar to the JIH, 2 of the top 5 most highly cited articles from the JIHT focused on similar topics. In the first, Hardy and Tabershaw59 described delayed chemical pneumonitis occurring among 17 workers exposed to beryllium compounds in a fluorescent lamp manufacturing company. The disease was unusual due to its delayed onset, marked weight loss, intense dyspnea, and poor prognosis.59 Hardy and colleagues would later go on to publish numerous other articles on beryllium in the JIHT’s successor journals the AMA-AIHOM, the AMA-AIH, and the AEH.64–68 Another highly cited paper in the JIHT also focused on beryllium, this time with Eisenbud, Wanta, and Dustan,63 describing nonoccupational berylliosis.
Archives of Industrial Hygiene and Occupational Medicine (1950) Highly cited articles from the third incarnation, the AIHOM, are displayed in Table 3.69–73 The most highly cited article from the AIHOM was a paper by Landahl and
Herrmann,69 which described the retention of vapors and gases in the human nose and lung. Their experiments were undertaken as part of a program to help evaluate factors involved in human gas exchange, as well as extending the investigation of particulate retention. Results obtained were intended to help assess the hazards of inhaled gases.69 Landahl and Herrmann had earlier published their report on the retention of airborne particulates in the human lungs in the JIHT during 1948.74 Parts II and III of these studies would eventually appear in the AMA-AIHOM.75,76
A.M.A. Archives of Industrial Hygiene and Occupational Medicine (1950–1954) Highly cited articles from the fourth incarnation, the AMA-AIHOM, are displayed in Table 4.77–81 Two articles from the list had focused on the same topic: “range-finding toxicity data.” The first most highly cited article comprised List IV of Smyth and colleagues’77 series range-finding toxicity data. The fifth most highly cited article was again a range-finding toxicity data paper by Smyth and colleagues,81 although this time it was “List V.” These articles were evidently part of a popular series written by the same authors who had earlier published List III in the JIHT during 1949.82
Table 3.—-Highly Cited Articles from the Archives of Industrial Hygiene and Occupational Medicine (1950)∗ Rank
Author(s)
Title of Article
Year
Volume
Pages
1 2 3
Landahl HD, Herrmann RG.69 Srbova J, Teisinger J, Skramovsky S.70 Cochran KW, Doull J, Mazur M, et al.71
1950 1950 1950
1 2 1
36–45 1–8 637–650
4
Hall RH, Scott JK, Laskin S, et al.72
1950
2
25–48
5
Lester D, Greenberg LA.73
Retention of vapors and gases in the human nose and lung. Absorption and elimination of inhaled benzene in man. Acute toxicity of zirconium, columbium, strontium, lanthanum, cesium, tantalum and yttrium. Acute toxicity of inhaled beryllium. III. Observations correlating toxicity with the physicochemical properties of beryllium oxide dust. The toxicity of sulfur hexafluoride.
1950
2
348–349
∗ As
identified by Scopus.
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Table 4.—-Highly Cited Articles from the A.M.A. Archives of Industrial Hygiene and Occupational Medicine (1950–1954)∗ Rank
Author(s)
Title of Article CS.77
1 2
Smyth HF Jr, Carpenter CP, Weil Carpenter CP, Weil CS, Smyth HF Jr.78
3
Silverman L, Lee G, Plotkin T, et al.79
4 5
Vorwald AJ, Durkan TM, Pratt PC.80 Smyth HF Jr, Carpenter CP, Weil CS, et al.81
∗ As
Range-finding toxicity data: List IV. Chronic oral toxicity of di-(2-ethylhexyl) phthalate for rats, guinea pigs, and dogs. Air flow measurements on human subjects with and without respiratory resistance at several work rates. Experimental studies of asbestosis. Range-finding toxicity data: List V.
Year
Volume
Pages
1951 1953
4 8
119–122 219–226
1951
3
461–478
1951 1954
3 10
1–43 61–68
identified by Scopus.
In later years, Lists VI, VII, and 8 (written as numerical “8” by the authors, rather than VIII) would subsequently appear in the American Industrial Hygiene Association Journal and Toxicology and Applied Pharmacology.83–85
A.M.A. Archives of Industrial Health (1955–1960) Highly cited articles from the fifth incarnation, the AMAAIH, are displayed in Table 5.86–90 The most highly cited article in this particular journal was a paper by Yaglou and Minard86 describing the control of heat casualties at military training centers. Aside from being the top-cited article in the AMA-AIH, their article was also the most highly cited article across all 5 versions of the journal between 1919 and 1960. Refer to Table 6. The purpose of Yaglou and Minard’s article was to describe a study that helped define conditions under which heat injury may occur in the military, as well as helping to develop safe limits for physical exertion in hot environments. Yaglou had earlier published an article on the effective temperature index in the JIH during 1927,91 and would later publish other classic papers relating to heat and thermal comfort in the AMA-AIH’s successor journal, the AEH.92,93 Constantin P. Yaglou (1897–1960) was himself a pioneering figure in thermal environment research, hav-
ing developed the Effective Temperature Scale, a measure of thermal comfort.94 Since 1965, the Northern Point of Belding Island near Antarctica (Yaglou Point) has been named in his honor.95 Aside from Yaglou’s thermal environment research, beryllium also made another appearance on a highly cited list, this time in an article by Curtis90 describing the diagnosis of beryllium disease, with special reference to the patch test. Category of Highly Cited Articles by Journal Figure 1 indicates the proportion of highly cited articles by category and journal. As a combined group, over one third (68%) were original articles, 12% reviews, 12% case series, and 8% data lists. Only 2 journals (the JIH and AMAAIHOM) contained highly cited articles that were reviews. All 5 citation classics from the AIHOM were original research articles, whereas the JIH, JIHT, and AMA-AIH all included highly cited case series. Citations Received in the Past 10 Years Figure 2 indicates the trend of total citations received by all 25 highly cited articles across the 5 different journal titles during the most recent 10-year period, 1999 to 2008. This graph suggests that although the journal may have changed titles over time, classic articles are still being cited in the
Table 5.—-Highly Cited Articles from the A.M.A. Archives of Industrial Health (1955–1960)∗ Rank
Author(s)
Title of Article
Year
Volume
Pages
1 2 3
Yaglou CP, Minard D.86 Carpenter CP, Pozzani UC, Weil CS, et al.87 MacKenzie RD, Byerrum RU, Decker CF, et al.88
1957 1956 1958
16 14 18
302–316 114–131 232–234
4
Wolf MA, Rowe VK, McCollister DD, et al.89
1956
14
387–398
5
Curtis GH.90
Control of heat casualties at military training centers. The toxicity of butyl cellosolve solvent. Chronic toxicity studies. II. Hexavalent and trivalent chromium administered in drinking water to rats. Toxicological studies of certain alkylated benzenes and benzene; experiments on laboratory animals. The diagnosis of beryllium disease, with special reference to the patch test.
1959
19
150–153
∗ As
36
identified by Scopus.
Archives of Environmental & Occupational Health
Table 6.—-Summary of the Most Highly Cited Article in EOH, 1919–1960∗ Authors: Constantin P. Yaglou and David Minard Title: Control of heat casualties at military training centers86 Journal: American Medical Association Archives of Industrial Health Date: October 1957 Citation: Volume 16, Number 4, Pages 302—316 Aim: To help define conditions under which heat injury may occur in the military and to develop safe limits for physical exertion in hot environments. Methods: Investigation of heat-related illness in three Marine Corps Training Centers during the summer of 1954. Results: Information on the analysis of heat loads and heat stress, heat casualties, tolerance limits for work in the heat, effectiveness of preventive measures, and the epidemiology of heat illness is provided. Conclusion: The prevention of heat casualties in military training needs to be addressed via a combination of strategies including changes in the training schedule and consideration of the thermal environment (particularly the “wet bulb-globe temperature”). ∗ As
identified by Scopus.
contemporary literature at an average rate of approximately 5 to 10 citations per year. DISCUSSION It has been suggested that no medical specialty is any better than its published literature.96 As such, the identification of highly cited articles in EOH highlights important citation-based trends for both the profession itself as well as the broader scientific community. From early on, it had been recognized that not all scientific articles were being cited at the same rate, and indeed, most citations were to
a few key papers in each field.97 One of the earliest bibliometric investigations conducted in EOH was published by McCunney and Harzbecker98 in 1992, who analyzed citation rates and impact factors in the British Journal of Industrial Medicine/Occupational and Environmental Medicine, the Journal of Occupational Medicine/Journal of Occupational and Environmental Medicine, the American Journal of Industrial Medicine, the Scandinavian Journal of Work, Environment & Health, as well as the International Archives of Occupational and Environmental Health. Nevertheless, citation classics were not identified. In 2001 and 2004, respectively, Takahashi et al99 and Navarro and Martin100 also
Fig. 1. Category of highly cited articles by journal. (As identified by Scopus.) OA = Original Article; RV = Review; CS = Case Series; DL = Data List.
2009, Vol. 64, Suppl. 1
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Fig. 2. Citations to highly cited articles over the past 10 years (1999–2008). (As identified by Scopus.)
published articles describing the literature of EOH; although again, no citation classics were identified. In 2006, Przyluska49 investigated the International Journal of Occupational Medicine and Environmental Health by using the Scopus database, although it was not until 2007 that a comprehensive investigation of highly cited articles, or citation classics, across a range of occupational medicine journals was first published by Gehanno and colleagues.101 In Gehanno and colleagues’ study from 2007,101 the R authors analyzed Web of Science citation counts for articles published in the British Journal of Industrial Medicine/Occupational and Environmental Medicine, the Journal of Occupational Medicine/Journal of Occupational and Environmental Medicine, the American Journal of Industrial Medicine, the Scandinavian Journal of Work, Environment & Health, as well as the International Archives of Occupational and Environmental Health. One major finding was that relatively few journals had attracted the majority of all citations, with 70% of the top 20 articles having been published by the British Journal of Industrial Medicine (now Occupational and Environmental Medicine). Interestingly, the AEOH was not included in Gehanno et al’s101 analysis, although EOH-related citation classics in some of the smaller periodicals such as Occupational Medicine (Oxford)45 and Industrial Health102,103 have been recently described. This may be part of an emerging trend, whereby citation-based analysis has become an increasingly popular topic in the occupational health field.97 It has recently been demonstrated, for example, that impact factors are definitely rising in many journals of occupational medicine.104 38
Despite a relatively limited number of studies being conducted in the field of EOH, the identification of highly cited papers in the current study has revealed some interesting trends. Perhaps the most important of all is the relatively old age of EOH citation classics and their proportionately low citation counts when compared to other fields. In Gehanno and colleagues’ study, for example,101 it was shown that the most highly cited paper in occupational medicine was from 1960, although it had received fewer than 1000 citations by 2007, and only 85 articles in the field had actually been cited more than 100 times. This can be compared to a 1951 laboratory methods article by Oliver Lowry and colleagues105 that had received almost 300,000 citations by 2005.106 The relative old age of Gehanno and colleagues’ top citation classic has not been confirmed by similar investigations undertaken in the smaller periodicals. In the current study, for example, the most highly cited article across all 5 titles, a 1957 report in the AMA-AIH by Yaglou and Minard,86 was not the oldest. This is consistent with previous studies conducted at Occupational Medicine (Oxford),45 where the journal’s most highly cited article of all time107 was only 5 years old. A similar situation was also demonstrated at Industrial Health,103 where the most highly cited article108 was only 8 years old. Such findings in EOH need to be seen in context, however, as history has shown that very few articles ever get cited at high rates. Garfield, for example, previously reported that of the 38 million “citable” articles published between 1900 and 2005, less than 1% were cited more than 200 times and half were not cited at all.5 There are a few reasons for this. Firstly, it takes time for an article to actually receive any Archives of Environmental & Occupational Health
citations, due to the time lag between publishing an article, having it recognized by interested authors, having it cited in their reference list, and then having these citations actually counted.109 Secondly, there is the category of article itself. Reviews and methods articles tend to attract a proportionately greater numbers of citations, for example, with the importance of reviews in attracting high citation counts being previously demonstrated in the smaller EOH journals of Japan103 and the UK,45 whereas the relative popularity of toxicology and laboratory-based research has been recently demonstrated.102 Special issues or theme issues may also be useful for raising awareness on a particular topic or a particular journal.110 Thirdly, most research fields have intrinsically different citation rates, some of which will tend to change over time. Garfield, for example, previously described how the criteria for a citation classic rose from about 250 citations in 1955 to about 1000 citations in 1995.111 The development of highly cited articles from an author’s perspective often provides an interesting insight into how the process works, such as Douglas’s reflection112 on the evolution of his highly cited paper in psychology,113 or Small’s114 examination of why authors think their articles were highly cited. Fourthly, it is important to note that the 5 journals investigated in the current study all had different publication histories and durations. The JIH, for example, ran from 1919 to 1935, whereas the AIHOM lasted less than a year, publishing only 2 volumes between January and September 1950. Although any article has the potential to be a highly cited, it is reasonable to assume that the longer a journal lasts, the more articles it will publish and the more likely that at least one of these articles might actually become a citation classic. As such, results from the current study need to be seen in context, as the relative “importance” of each journal’s citation classics should be considered with regard to how long that title existed and how many articles it published. Aside from considering the most highly cited articles in a given field, it is also important to acknowledge other articles that, although not highly cited, are nevertheless classics that have stood the test of time. Sabin’s 1960 paper on the live polio vaccine,115 although representing one of the most important discoveries in public health, was not destined to become a citation classic.116 Regarding articles published in the AEOH’s predecessor journals between 1919 and 1959, there are many such examples in various categories. Legge’s 1920 article, for example, on the notification of industrial diseases in Great Britain between 1900 and 1918,117 may be seen as a pioneering effort in the field of occupational epidemiology. Another classic in this field, Sappington’s 1924 investigation of sickness-related absences in the Edison Electric Illuminating Company of Boston118 also highlighted the importance of reproductive system disorders and their negative effect on female workers and work productivity. Interestingly, the issue of dysmenorrhea as an industrial problem had been raised a few years earlier in the JIH by Meaker119 and Sturgis.120 Although reproductive system disorders and their effect on 2009, Vol. 64, Suppl. 1
female workers have been achieving greater attention in the occupational health field during recent years,121,122 these articles from the JIH suggest that the concept had, in fact, been recognized and quantified many years earlier, even before the Moos Menstrual Distress Questionnaire was first proposed in 1968.123 Some other classic articles from the JIH, this time in the field of what would now be known as occupational hygiene, include Katherine and Philip Drinkers’ 1928 article on metal fume fever,58 Drinker and colleagues’ 1928 article on dust and fume inhalation in man,124 and Hatch and colleagues’ 1932 modification of the Greenburg-Smith Impinger.125 In the field of thermal physiology, Yaglou and Drinker published a classic article in 1928126 describing their study of the relationship between climate and type of underclothing worn. Four years later in the same journal, Vernon described the measurement of radiant heat in relation to human comfort.127 Toxicology was evidently another interest area for the JIH, with Prodan’s 1932 article on Cadmium poisoning128 offering important early insights into this disease. Various classic articles on the topic of occupational cancers would later be published in the journal, such as Baetjer’s 1950 series on pulmonary carcinoma in chromate workers,129,130 and Barsotti and Vigliani’s 1952 study on bladder lesions caused by aromatic amines.131 Analysis of highly cited articles in the current study also revealed a few surprises. Firstly, it is interesting to note that over two thirds of the citation classics were originals and only 12% were reviews. This is contrary to contemporary knowledge that suggests that review articles tend to be cited more often than originals.97 It may be that papers identified in the current study represent some of the earliest documented scientific evidence on these particular topics as they emerged in the literature. As such, subsequent authors would be inclined to cite the original research and the earliest documented findings. Secondly, the work of some well-known scientists does not appear to have been highly cited. Although she was no doubt a pioneering figure in EOH and had even been on the editorial board of the JIH from its foundation until her retirement,132 no articles from Alice Hamilton, for example, were destined to become citation classics. This phenomenon would appear to be similar to the aforementioned fate of Albert Sabin’s classic article on polio vaccine, and suggests that high citation counts are not necessarily the only indicator of scientific or humanitarian greatness. CONCLUSIONS Although citations are being increasingly seen as the “currency” of modern science,133 and lists of citation classics have been compiled in various fields, few, if any, authors appear to have used any databases to identify citation classics in the AEOH or its predecessor journals. In the current study, topics such as metal fume fever and various studies of beryllium were shown to have been regularly cited, whereas the most highly cited article of all was a 1957 paper 39
describing the control of heat casualties at military training centers. Citation trends in EOH may not necessarily mirror those of the basic sciences, however, given that the most highly cited article was by no means the oldest. Furthermore, unlike laboratory science and some other disciplines,134 the most highly cited articles in EOH were not found to be “methods” papers. Such findings reinforce the notion that EOH is a diverse “boundary” discipline, the nexus where many different fields meet.135 Overall, this study suggests that although some citation patterns in EOH reflect those of other disciplines, the trend is not uniform and EOH itself appears to have some distinctive bibliometric characteristics. ********** For comments and further information, address correspondence to Professor Derek R. Smith, WorkCover New South Wales Research Centre of Excellence, School of Health Sciences, Faculty of Health, University of Newcastle, Ourimbah, New South Wales 2258 Australia. E-mail:
[email protected]
********** References 1. Smith DR, Gehanno JF, Takahashi K. Bibliometric research in occupational health. Ind Health. 2008;46:519–522. 2. Garfield E. Introducing Citation Classics: The human side of scientific reports. Essays of an Information Scientist. 1977;3:1–2. 3. Garfield E. Citation indexes for science; a new dimension in documentation through association of ideas. Science. 1955;122:108–111. 4. Garfield E. How it all began: With a loan from HFC. Essays of an Information Scientist. 1980;4:359–362. 5. Garfield E. The history and meaning of the journal impact factor. JAMA. 2006;295:90–3. 6. Garfield E. Citation indexing, historio-bibliography and the sociology of science. Essays of an Information Scientist. 1971;1:158–174. 7. Garfield E. Selecting the all-time citation classics: here are the fifty most cited papers for 1961–1972. Essays of an Information Scientist. 1974;2:6–9. 8. Garfield E. Highly cited articles. 26. Some classic papers of the late 19th and early 20th centuries. Essays of an Information Scientist. 1976;2:491–495. 9. Garfield E. The 100 most-cited papers ever and how we select Citation Classics. Essays of an Information Scientist. 1984;7:175–181. 10. Smith DR, Leggat PA. Ten citation classics from the Australian and New Zealand Journal of Public Health. Aust N Z J Public Health. 2008;32:105–106. 11. Garfield E. 100 classics from the Lancet. Essays of an Information Scientist. 1984;7:295–305. 12. Garfield E. 100 classics from the New England Journal of Medicine. Essays of an Information Scientist. 1984;7:186–193. 13. Garfield E. 101 citation classics from the Annals of Internal Medicine. Essays of an Information Scientist. 1984;7:374–384. 14. Garfield E. 100 citation classics from the Journal of the American Medical Association. JAMA. 1987;257:52–9. 15. Garfield E. The 1983 articles most cited in the SSCI, 1983–1985. Part 2. From anthropology to urban studies: a second group of papers represents 30 of the 54 SSCI subject categories, including Sociology, Education, and Public Health. Essays of an Information Scientist. 1987;10:319–327. 16. Smith D. Highly-cited articles in the Australian Dental Journal. Aust Dent J. 2008;53:265–266. 17. Casey AE. Influence of individual North American and British journals on medical progress in the United States and Britain. Bull Med Libr Assoc. 1942;30:464–466. 18. Raisig LM. Statistical bibliography in the health sciences. Bull Med Libr Assoc. 1962;50:450–461. 19. Key JD, Kempers RD. Citation classics: most-cited articles from Fertility and Sterility. Fertil Steril. 1987;47:910–915. 40
20. Yang H, Pan B. Citation classics in Fertility and Sterility, 1975–2004. Fertil Steril. 2006;86:795–797. 21. Key JD. Citation classics: most-cited articles from Archives of PM&R. Arch Phys Med Rehabil. 1988;69:1058–1059. 22. Thompson DF. Fifteen “citation classics” from the American Journal of Hospital Pharmacy. Am J Hosp Pharm. 1989;46:126–128. 23. The 200 most cited articles from The Journal of Investigative Dermatology. J Invest Dermatol. 1989;92:142S–147S. 24. Daniel TM, Young BA. Landmark Articles and Citation Classics in the Journal of Laboratory and Clinical Medicine. J Lab Clin Med. 1990;116:755–756. 25. Dubin D, Hafner AW, Arndt KA. Citation classics in clinical dermatologic journals. Citation analysis, biomedical journals, and landmark articles, 1945–1990. Arch Dermatol. 1993;129:1121–1129. 26. Stern RS, Arndt KA. Classic and near-classic articles in the dermatologic literature. Arch Dermatol. 1999;135:948–950. 27. Stern RS, Arndt KA. Top cited authors in dermatology: a citation study from 24 journals: 1982–1996. Arch Dermatol. 1999;135:299–302. 28. Stern RS, Arndt KA. Top-cited dermatology authors publishing in 5 “high-impact” general medical journals. Arch Dermatol. 2000;136:357–361. 29. Nguyen NQ, Moy RL. Authors in Dermatologic Surgery. Dermatol Surg. 2000;26:1092–1095. 30. Smith DR. Bibliometrics, dermatology and contact dermatitis. Contact Dermatitis. 2008;59:133–136. 31. Smith DR. Ten citation classics from the New Zealand Medical Journal. N Z Med J. 2007;120:U2871. 32. Paladugu R, Schein M, Gardezi S, Wise L. One hundred citation classics in general surgical journals. World J Surg. 2002;26:1099–1105. 33. Chen TW, Chou LF, Chen TJ. World trend of peritoneal dialysis publications. Perit Dial Int. 2007;27:173–178. 34. Jones AW. Impact of JAT publications 1981–2003: the most prolific authors and the most highly cited articles. J Anal Toxicol. 2004;28:541–545. 35. Mehlman CT, Wenger DR. The top 25 at 25: citation classics in the Journal of Pediatric Orthopaedics. J Pediatr Orthop. 2006;26:691–694. 36. Loonen MP, Hage JJ, Kon M. Value of citation numbers and impact factors for analysis of plastic surgery research. Plast Reconstr Surg. 2007;120:2082–2091. 37. Smith DR. The historical development of academic journals in occupational medicine,1901–2009. Arch Environ Occup Health. 2009;64(Suppl 1):8–17. 38. Smith DR. Historical development of the Archives of Environmental & Occupational Health and its predecessor journals, 1919–2009. Arch Environ Occup Health. 2009;64(Suppl 1):18–31. 39. Smith DR. A 30-year citation analysis of bibliometric trends at the Archives of Environmental Health, 1975–2004. Arch Environ Occup Health. 2009:64(Suppl 1):43–54. 40. Smith DR, Hazelton M. Bibliometrics, citation indexing, and the journals of nursing. Nurs Health Sci. 2008;10:260–265. 41. Garfield E. Incomplete citations and other sources of bibliographic chaos. Essays of an Information Scientist. 1969;1:40. 42. Smith DR, Takahashi K. Towards uniform requirements for manuscripts submitted to journals in occupational medicine. Occup Med (Lond). 2007;57:613–614. 43. Bevan DR, Purkis JM. Citation errors can be reduced. Can J Anaesth. 1995;42:367–369. 44. Vickers MD. Citation errors—there is still much to be done. Can J Anaesth. 1995;42:1063. 45. Smith DR. Citation trends and citation classics at Occupational Medicine. Occup Med (Lond). 2008;58:80–82. 46. Bakkalbasi N, Bauer K, Glover J, Wang L. Three options for citation tracking: Google Scholar, Scopus and Web of Science. Biomed Digit Libr. 2006;3:7. 47. Falagas ME, Pitsouni EI, Malietzis GA, Pappas G. Comparison of PubMed, Scopus, Web of Science, and Google Scholar: strengths and weaknesses. FASEB J. 2008;22:338–342. 48. Meho LI, Rogers Y. Citation counting, citation ranking, and hindex of human-computer interaction researchers: a comparison of scopus and web of science. J Am Soc Inf Sci Technol. 2008;59: 1711–1726. 49. Przyluska J. International Journal of Occupational Medicine and Environmental Health in world documentation services: the SCOPUS Archives of Environmental & Occupational Health
50. 51. 52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70. 71. 72.
73. 74. 75. 76. 77.
based analysis of citation. Int J Occup Med Environ Health. 2006;19: 1–5. Meho LI, Yang K. Impact of data sources on citation counts and rankings of LIS faculty: Web of science versus scopus and google scholar. J Am Soc Inf Sci Technol. 2007;58:2105–2125. Drinker P, Thomson RM, Finn JL. Metal fume fever: II. Resistance acquired by inhalation of zinc oxide on two successive days. J Ind Hyg. 1927;9:98–105. Edsall DL, Wilbur FP, Drinker CK. The occurrence, course and prevention of chronic manganese poisoning. J Ind Hyg. 1919;1:183–193. Haggard HW. The toxicology of hydrogen sulphide. J Ind Hyg. 1925;7:113–121. Bulmer FM, Mackenzie EA. Studies in the control and treatment of “Nickel Rash.” J Ind Hyg. 1926;8:517–527. Drinker P, Thomson RM, Finn JL. Metal fume fever: IV. Threshold doses of zinc oxide, preventive measures, and the chronic effects of repeated exposures. J Ind Hyg. 1927;9:331–345. Sturgis CC, Thompson PD. Metal fume fever: I. Clinical observations on the effect of the experimental inhalation of zinc oxide by two apparently normal persons. J Ind Hyg. 1927;9:88–97. Drinker P, Thompson RM, Finn JL. Metal fume fever: III. The effects of inhaling magnesium oxide fume. J Ind Hyg. 1927;9:187–192. Drinker KR, Drinker P. Metal fume fever:V. Results of the inhalation by animals of zinc and magnesium oxide fumes. J Ind Hyg. 1928;10:56–70. Hardy HL, Tabershaw IR. Delayed chemical pneumonitis occurring in workers exposed to beryllium compounds. J Ind Hyg Toxicol. 1946;28:197–211. Hueper WC, Wiley FH, Wolfe HD. Experimental production of bladder tumors in dogs by administration of beta-naphthylamine. J Ind Hyg Toxicol. 1938;20:46–84. Deichmann WB, LeBlanc TJ. Determination of the approximate lethal dose with about six animals. J Ind Hyg Toxicol. 1943;25:415–417. Levine L, Fahy JP. Evaluation of urinary lead concentrations. I. The significance of the specific gravity. J Ind Hyg Toxicol. 1945;27:217–223. Eisenbud M, Wanta RC, Dustan C, Steadman LT, Harris WB, Wolf BS. Non-occupational berylliosis. J Ind Hyg Toxicol. 1949;31:282–294. Hardy H. Beryllium Case Registry progress report: 1962. Arch Environ Health. 1962;5:265–268. Hardy HL. The disability found in persons exposed to certain beryllium compounds. AMA Arch Ind Health. 1955;12:174–181. Hardy HL. Epidemiology, clinical character, and treatment of beryllium poisoning; progress report. AMA Arch Ind Health. 1955;11:273–279. Hardy HL. Medical control of beryllium; discussion of paper by Dr. Zielinski. AMA Arch Ind Health. 1959;19:203–204. Hardy HL, Bartter FC, Jaffin AE. Metabolic study of a case of chronic beryllium poisoning treated with ACTH. AMA Arch Ind Hyg Occup Med. 1951;3:579–582. Landahl HD, Herrmann RG. Retention of vapors and gases in the human nose and lung. Arch Ind Hyg Occup Med. 1950;1:36–45. Srbova J, Teisinger J, Skramovsky S. Absorption and elimination of inhaled benzene in man. Arch Ind Hyg Occup Med. 1950;2:1– 8. Cochran KW, Doull J, Mazur M, DuBois KP. Acute toxicity of zirconium, columbium, strontium, lanthanum, cesium, tantalum and yttrium. Arch Ind Hyg Occup Med. 1950;1:637–650. Hall RH, Scott JK, Laskin S, Stroud CA, Stokinger HE. Acute toxicity of inhaled beryllium. III. Observations correlating toxicity with the physicochemical properties of beryllium oxide dust. Arch Ind Hyg Occup Med. 1950;2:25–48. Lester D, Greenberg LA. The toxicity of sulfur hexafluoride. Arch Ind Hyg Occup Med. 1950;2:348–349. Landahl HD, Herrmann RG. On the retention of air-borne particulates in the human lung. J Ind Hyg Toxicol. 1948;30:181–188. Landahl HD, Tracewell TN, Lassen WH. On the retention of airborne particulates in the human lung: II. AMA Arch Ind Hyg Occup Med. 1951;3:359–366. Landahl HD, Tracewell TN, Lassen WH. Retention of air-borne particulates in the human lung. III. AMA Arch Ind Hyg Occup Med. 1952;6:508–511. Smyth HF Jr, Carpenter CP, Weil CS. Range-finding toxicity data: list IV. AMA Arch Ind Hyg Occup Med. 1951;4:119–122.
2009, Vol. 64, Suppl. 1
78. Carpenter CP, Weil CS, Smyth HF Jr. Chronic oral toxicity of di-(2ethylhexyl) phthalate for rats, guinea pigs, and dogs. AMA Arch Ind Hyg Occup Med. 1953;8:219–226. 79. Silverman L, Lee G, Plotkin T, Sawyers LA, Yancey AR. Air flow measurements on human subjects with and without respiratory resistance at several work rates. AMA Arch Ind Hyg Occup Med. 1951;3:461– 478. 80. Vorwald AJ, Durkan TM, Pratt PC. Experimental studies of asbestosis. AMA Arch Ind Hyg Occup Med. 1951;3:1–43. 81. Smyth HF Jr, Carpenter CP, Weil CS, Pozzani UC. Range-finding toxicity data: list V. AMA Arch Ind Hyg Occup Med. 1954;10:61– 68. 82. Smyth HF Jr, Carpenter CP, Weil CS. Range-finding toxicity data; list III. J Ind Hyg Toxicol. 1949;31:60–2. 83. Carpenter CP, Weil CS, Smyth HF Jr. Range-finding toxicity data: list 8. Toxicol Appl Pharmacol. 1974;28:313–319. 84. Smyth HF Jr, Carpenter CP, Weil CS, Pozzani UC, Striegel JA. Range-finding toxicity data: list VI. Am Ind Hyg Assoc J. 1962;23:95– 107. 85. Smyth HF Jr, Carpenter CP, Weil CS, Pozzani UC, Striegel JA, Nycum JS. Range-finding toxicity data: list VII. Am Ind Hyg Assoc J. 1969;30:470–476. 86. Yaglou CP, Minard D. Control of heat casualties at military training centers. AMA Arch Ind Health. 1957;16:302–316. 87. Carpenter CP, Pozzani UC, Weil CS, Nair JH 3rd., Keck GA, Smyth HF Jr. The toxicity of butyl cellosolve solvent. AMA Arch Ind Health. 1956;14:114–131. 88. MacKenzie RD, Byerrum RU, Decker CF, Hoppert CA, Langham RF. Chronic toxicity studies. II. Hexavalent and trivalent chromium administered in drinking water to rats. AMA Arch Ind Health. 1958;18:232–234. 89. Wolf MA, Rowe VK, McCollister DD, Hollingsworth RL, Oyen F. Toxicological studies of certain alkylated benzenes and benzene; experiments on laboratory animals. AMA Arch Ind Health. 1956;14:387–398. 90. Curtis GH. The diagnosis of beryllium disease, with special reference to the patch test. AMA Arch Ind Health. 1959;19:150–153. 91. Yaglou CP. Temperature, humidity, and air movement in industries: the effective temperature index. J Ind Hyg. 1927;9:297–309. 92. Yaglou CP. Effect of geographical origin on performance in heat. Arch Environ Health. 1961;2:1–8. 93. Yaglou CP. Limits for cold, heat and humidity in underground shelters. Arch Environ Health. 1961;2:110–115. 94. Whittenberger JL, Silverman L, Fair GM, Drinker P. Constantin Prodromos Yaglou, 1897–1960. Arch Environ Health. 1961;2: 93–94. 95. United States Geographic Names Information System (GNIS). Antarctica Features Detail: Yaglou Point. Available at: http://geonames.usgs. gov/pls/gnispublic/f?p = 106:3:2810775270374312::NO:3:P3 ANTAR ID,P3 TITLE:16847%2CYaglou%20Point (Accessed 28 January 2009). 96. Felton JS. Books on occupational health and their medical authors. Ind Med Surg. 1957;26:260–262. 97. Smith DR. Historical development of the journal impact factor and its relevance for occupational health. Ind Health. 2007;45:730–742. 98. McCunney RJ, Harzbecker J. The influence of occupational medicine on general medicine: a look at the journals. J Occup Med. 1992;34:279–286. 99. Takahashi K, Hoshuyama T, Ikegami K, Itoh T, Higashi T, Okubo T. A bibliometric study of the trend in articles related to epidemiology published in occupational health journals. Occup Environ Med. 1996;53:433–438. 100. Navarro A, Martin M. Scientific production and international collaboration in occupational health, 1992–2001. Scand J Work Environ Health. 2004;30:223–233. 101. Gehanno JF, Takahashi K, Darmoni S, Weber J. Citation classics in occupational medicine journals. Scand J Work Environ Health. 2007;33:245–251. 102. Smith DR. Japanese journals also have their citation classics in occupational medicine. Scand J Work Environ Health. 2007;33: 397–399. 103. Smith DR, Sawada S, Araki S. Twenty years of publishing trends and citation indexing at INDUSTRIAL HEALTH, 1987–2006. Ind Health. 2007;45:717–720. 41
104. Smith DR. Citation analysis and impact factor trends of 5 core journals in occupational medicine,1985–2006. Arch Environ Occup Health. 2008;63:114–122. 105. Lowry OH, Rosebrough NJ, Farr AL, Randall RJ. Protein measurement with the Folin phenol reagent. J Biol Chem. 1951;193:265–275. 106. Top 10 papers published. The Scientist. 2005;19:26. 107. Knutsson A. Health disorders of shift workers. Occup Med (Lond). 2003;53:103–108. 108. Kawakami N, Haratani T. Epidemiology of job stress and health in Japan: review of current evidence and future direction. Ind Health. 1999;37:174–186. 109. Smith DR. Citation indexing and highly cited articles in the Australian Veterinary Journal. Aust Vet J. 2008;86:337–339. 110. Smith DR, Leggat PA, Araki S. Emerging occupational hazards among health care workers in the new millennium. Ind Health. 2007;45:595–597. 111. Garfield E. Interview with Eugene Garfield, Chairman Emeritus of the Institute for Scientific Information (ISI). Cortex. 2001;37:575–577. 112. Douglas RJ. How to write a highly cited article without even trying. Psychol Bull. 1992;112:405–408. 113. Douglas RJ. The hippocampus and behavior. Psychol Bull. 1967;67:416–422. 114. Small H. Why authors think their papers are highly cited. Scientometrics. 2004;60:305–316. 115. Sabin AB, Ramos-Alvarez M, Alvarez-Amezquita J, Pelon W, Michaels RH, Spigland I, Koch MA, Barnes JM, Rhim JS. Live, orally given poliovirus vaccine. Effects of rapid mass immunization on population under conditions of massive enteric infection with other viruses. JAMA. 1960;173:1521–1526. 116. Smith DR. Journal impact factors: what do they mean for public health? Aust N Z J Public Health. 2007;31:581–582. 117. Legge TM. Twenty years’ experience of the notification of industrial diseases. J Ind Hyg. 1920;1:590–596. 118. Sappington CO. A five years’ sickness and accident experience in the Edison Electric Illuminating Company of Boston. J Ind Hyg. 1924;6:81–101. 119. Meaker SR. A preliminary note on dysmenorrhea as an industrial problem. J Ind Hyg. 1922;4:49–52. 120. Sturgis MC. Observations on dysmenorrhea occurring in women employed in a large department store. J Ind Hyg. 1923;5:53–56.
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121. Smith DR. Menstrual disorders and their adverse symptoms at work: an emerging occupational health issue in the nursing profession. Nurs Health Sci. 2008;10:222–228. 122. Smith DR, Mihashi M, Adachi Y, Shouyama Y, Mouri F, Ishibashi N, Ishitake T. Menstrual disorders and their influence on low back pain among Japanese nurses. Ind Health. 2009;47:301– 312. 123. Moos RH. The development of a menstrual distress questionnaire. Psychosom Med. 1968;30:853–867. 124. Drinker P, Thomson RM, Finn JL. Quantitative measurements of the inhalation, retention, and exhalation of dusts and fumes by man: 1. Concentrations of 50 to 450 mg per cubic meter. J Ind Hyg. 1928;10:13–25. 125. Hatch T, Warren H, Drinker P. Modified form of the Greenburg-Smith Impinger for field use, with a study of its operating characteristics. J Ind Hyg. 1932;14:301–309. 126. Yaglou CP, Drinker P. The summer comfort zone: climate and clothing. J Ind Hyg. 1928;10:350–363. 127. Vernon HM. The measurement of radiant heat in relation to human comfort. J Ind Hyg. 1932;14:95–111. 128. Prodan L.Cadmium poisoning: I. The history of Cadmium poisoning and uses of Cadmium. J Ind Hyg. 1932;14:132–155. 129. Baetjer AM.Pulmonary carcinoma in chromate workers. II. Incidence on basis of hospital records. AMA Arch Ind Hyg Occup Med. 1950;2:505–516. 130. Baetjer AM.Pulmonary carcinoma in chromate workers. 1. A review of the literature and report of cases. AMA Arch Ind Hyg Occup Med. 1950;2:487–504. 131. Barsotti M, Vigliani EC. Bladder lesions from aromatic amines; statistical considerations and prevention. AMA Arch Ind Hyg Occup Med. 1952;5:234–241. 132. Drinker P. Ceremony for Professors Emeriti Harvard School of Public Health. Ind Med Surg. 1959;28:224–225. 133. Joseph KS. Quality of impact factors of general medical journals. BMJ. 2003;326:283. 134. Csako G. Analysis of the most highly cited articles from the 50-year history of CCA. Clin Chim Acta. 2007;375:43–48. 135. Smith DR, Guidotti TL. The peer-review process and its relationship with environmental and occupational health. Arch Environ Occup Health. 2008;63:3–6.
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