July 2007
Bibliometric Analysis
for the U.S. Environmental Protection Agency/Office of Research
and Development's Endocrine Disrupting Chemicals (EDCs)
Research Program
This is a bibliometric analysis of the papers prepared by intramural and extramural researchers
of the U.S. Environmental Protection Agency's (EPA) Endocrine Disrupting Chemicals
(EDCs) Research Program. For this analysis, 519 papers were reviewed, and they were
published from 1997 to 2007. These publications were cited 8,997 times in the journals
covered by Thomson's Web of Science1 and Scopus2. Of these 519 publications, 455 (87.7%)
have been cited at least once in a journal.
Searches of Thomson Scientific's Web of Science and Elsevier's Scopus were conducted to
obtain times cited data for the EDCs journal publications. The analysis was completed using
Thomson's Essential Science Indicators (ESI) and Journal Citation Reports (JCR) as
benchmarks. ESI provides access to a unique and comprehensive compilation of essential
science performance statistics and science trends data derived from Thomson's databases. For
this analysis, the ESI highly cited papers thresholds as well as the hot papers thresholds were
used to assess the influence and impact of the EDCs papers. JCR is a recognized authority for
evaluating journals. It presents quantifiable statistical data that provide a systematic, objective
way to evaluate the world's leading journals and their impact and influence in the global
research community. The two key measures used in this analysis to assess the journals in
which the EPA EDCs papers are published are the Impact Factor and Immediacy Index. The
Impact Factor is a measure of the frequency with which the "average article" in a journal has
been cited in a particular year. The Impact Factor helps evaluate a journal's relative
importance, especially when compared to other journals in the same field. The Immediacy
Index is a measure of how quickly the "average article" in a journal is cited. This index
indicates how often articles published in a journal are cited within the same year and it is useful
in comparing how quickly journals are cited.
The report includes a summary of the results of the bibliometric analysis, an analysis of the 519
EDCs research papers analyzed by ESI field (e.g., Environment/Ecology, Pharmacology &
Toxicology, Plant & Animal Science), an analysis of the journals in which the EDCs papers
were published, a table of the highly cited researchers in the EDCs Research Program, and an
indication of whether any patents have resulted from the program.
Thomson Scientific's Web of Science provides access to current and retrospective multidisciplinary information
from approximately 8,830 of the most prestigious, high impact research journals in the world. Web of Science also
provides cited reference searching.
2
Scopus is a large abstract and citation database of research literature and quality Web sources designed to support
the literature research process. Scopus offers access to 15,000 titles from 4,000 different publishers, more than
12,850 academic journals (including coverage of 535 Open Access journals, 750 conference proceedings, and 600
trade publications), 27 million abstracts, 245 million references, 200 million scientific Web pages, and 13 million
patent records.
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
SUMMARY OF RESULTS
l. More than one-quarter of the EDCs publications are highly cited papers. 144 (27.8%) of
the EDCs papers qualify as highly cited when using the ES/ criteria for the top 10% of highly
cited publications. This is 2.8 times the 10% of papers expected to be highly cited. 14 (2.7%) of
the EDCs papers qualify as highly cited when using the ES/ criteria for the top 1 %, which is 2.7
times the number expected. 4 (0.8%) of these papers qualify as very highly cited when using the
criteria for the top 0.1%, which is 8 times the number anticipated. 3 (0.6%) papers actually meet
the 0.01 % threshold for the most highly cited papers, which is 60 times the expected number for
this program.
2. The EDCs papers are more highly cited than the average paper. Using the ESI average
citation rates for papers published by field as the benchmark, in 11 of the 15 fields in which the
519 EPA EDCs papers were published, the ratio of actual to expected cites is greater than 1,
indicating that the EDCs papers are more highly cited than the average papers in those fields.
For all 15 fields combined, the ratio of total number of cites to the total number of expected cites
(8,997 to 4,582.3) is 2.0, indicating that the EDCs papers are more highly cited than the average
paper.
3. Nearly one-half of the EDCs papers are published in high impact journals. 213 of the 519
papers were published in the top 10% of journals ranked by JCF? Impact Factor, representing
41.0% of EPA's EDCs papers. This number is 4.1 times higher than the expected 52 papers.
228 of the 519 papers appear in the top 10% of journals ranked by JCf? Immediacy Index,
representing 43.9% of EPA's EDCs papers. This number is 4.4 times higher than the expected
52 papers.
4. Four of the EDCs papers qualify as hot papers. Using the hot paper thresholds established
by ESI as a benchmark, 4 hot papers, representing 0.8% of the EDCs papers, were identified in
the analysis. Hot papers are papers that were highly cited shortly after they were published. The
number of EDCs hot papers identified is 8 times higher than the expected 0.5 hot papers.
5. The authors of the EDCs papers cite themselves much less than the average author. 418
of the 8,997 cites are author self-cites. This 4.6% author self-citation rate is well below the
accepted range of 10-30% author self-citation rate.
6. Seventeen of the authors of the EDCs papers are included in ISIHighlyCited.com, which is
a database of the world's most influential researchers who have made key contributions to
science and technology during the period from 1981 to 1999.
7. No patents were issued and no patent applications were filed by investigators from 1997 to
2007 for research that was conducted under EPA's EDCs research program.
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
Highly Cited EDCs Publications
All of the journals covered by ESI are assigned a field, and to compensate for varying citation rates
across scientific fields, different thresholds are applied to each field. Thresholds are set to select
highly cited papers to be listed in ESI. Different thresholds are set for both field and year of
publication. Setting different thresholds for each year allows comparable representation for older and
younger papers for each field.
The 519 EDCs research papers reviewed for this analysis were published in journals that were assigned
to 15 of the 22 ESI fields. The distribution of the papers among these 15 fields and the number of
citations by field are presented in Table 1.
Tablet. EDCs Papers by ESI Fields
ESI Field
Agricultural Sciences
Biology & Biochemistry
Chemistry
Clinical Medicine
Computer Science
Engineering
Environment/Ecology
Geosciences
Microbiology
Molecular Biology & Genetics
Multidisciplinary
Neuroscience & Behavior
Pharmacology & Toxicology
Plant & Animal Science
Social Sciences, general
No. of Citations
18
961
247
1,124
37
2
2,284
3
1
32
776
213
2,552
731
16
Total = 8,997
No. of EPA Papers
3
67
27
59
2
4
152
1
1
4
11
21
108
57
2
Total = 519
Average Cites/Paper
6.0
14.3
9.1
19.0
18.5
0.5
15.0
3.0
1.0
8.0
70.5
10.1
23.6
12.8
8.0
17.3
There are 144 (27.8% of the papers analyzed) highly cited EPA EDCs papers in 10 of the 15 fields—
Agricultural Sciences, Biology & Biochemistry, Chemistry, Clinical Medicine, Computer Science,
Environment/Ecology, Multidisciplinary, Pharmacology & Toxicology, Plant & Animal Science, and
Social Sciences—when using the ESI criteria for the top 10% of papers. Table 2 shows the number
of EPA papers in those 10 fields that meet the top 10% threshold in ESI. Fourteen (2.7%) of the
papers analyzed qualify as highly cited when using the ESI criteria for the top 1% of papers. These
papers cover 4 fields—Computer Science, Environment/Ecology, Multidisciplinary, and
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
Pharmacology & Toxicology. Table 3 shows the 14 papers by field that meet the top 1% threshold in
ESI. The citations for these 14 papers are provided in Tables 4 through 7. There were 4 (0.8%) very
highly cited EDCs papers in the fields of Environment/Ecology and Multi disciplinary. These papers,
which met the top 0.1% threshold in ESI, are listed in Table 8. Three (0.6%) of the EDCs papers met
the top 0.01% threshold in ESI, which is 60 times the expected number of papers that should meet
this threshold for this size program. This paper is listed in Table 9.
Table 2. Number of Highly Cited EDCs Papers by Field (top 10%)
ESI Field
Agricultural Sciences
Biology & Biochemistry
Chemistry
Clinical Medicine
Computer Science
Environment/Ecology
Multidisciplinary
Pharmacology & Toxicology
Plant & Animal Science
Social Sciences, general
No. of Citations
15
264
113
555
37
1,460
764
1,923
551
16
Total = 5,698
No. of Papers
1
9
2
13
2
47
7
40
21
2
Total = 144
Average Cites/Paper
15.0
29.3
56.5
42.7
18.5
31.1
109.1
48.1
26.2
8.0
39.6
% of Papers in Field
33.3%
13.4%
7.4%
22.0%
100.0%
30.9%
63.6%
37.0%
36.8%
100.0%
27.8%
Table 3. Number of Highly Cited EDCs Papers by Field (top 1%)
ESI Field
Computer Science
Environment/Ecology
Multidisciplinary
Pharmacology & Toxicology
No. of
Citations
18
365
698
470
Total =
1,551
No. of
Papers
1
5
5
3
Total =
14
Average
Cites/Paper
18.0
73.0
139.6
156.7
110.8
% of EPA
Papers in
Field
50.0%
3.3%
45.4%
2.8%
2.7%
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
Table 4. Highly Cited EDCs Papers in the Field of Computer Science (top 1%)
No. of
Cites
18
First Author
Ouyang M
Paper
Gaussian mixture clustering and imputation of microarray data.
Bioinformatics 2004;20(6) : 9 1 7-923 .
Table 5. Highly Cited EDCs Papers in the Field of Environment/Ecology (top 1%)
No. of
Cites
169
102
17
71
6
First Author
Crisp TM
Ankley GT
Mills LJ
SwanSH
LeBlanc GA
Paper
Environmental endocrine disruption: an effects assessment and
analysis. Environmental Health Perspectives 1998;106(Suppl 1):11-
56.
Description and evaluation of a short-term reproduction test with the
fathead minnow (Pimephales promelas). Environmental Toxicology
and Chemistry 2001;20(6): 1276-1290.
Review of evidence: are endocrine-disrupting chemicals in the aquatic
environment impacting fish populations? Science of the Total
Environment 2005;343(l-3): 1-34.
Decrease in anogenital distance among male infants with prenatal
phthalate exposure. Environmental Health Perspectives
2005;113(8):1056-1061.
Crustacean endocrine toxicology: a review. Ecotoxicology
2007;16(1):61-81.
Table 6. Highly Cited EDCs Papers in the Field of Multidisciplinary (top 1%)
No. of
Cites
First Author
Paper
106
DasSK
Estrogenic responses in estrogen receptor-alpha deficient mice reveal
a distinct estrogen signaling pathway. Proceedings of the National
Academy of Sciences of the United States of America 1997;94(24):
12786-12791.
124
Hawkins MB
Identification of a third distinct estrogen receptor and reclassification
of estrogen receptors in teleosts. Proceedings of the National
Academy of Sciences of the United States of America 2000;97(20):
10751-10756.
181
ZhuY
Identification, classification, and partial characterization of genes in
humans and other vertebrates homologous to a fish membrane
progestin receptor. Proceedings of the National Academy of Sciences
of the United States of America 2003;100(5):2237-2242.
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
No. of
Cites
182
105
First Author
ZhuY
Anway MD
Paper
Cloning, expression, and characterization of a membrane progestin
receptor and evidence it is an intermediary in meiotic maturation of
fish oocytes. Proceedings of the National Academy of Sciences of the
United States of America 2003; 100(5):223 1-2236.
Epigenetic transgenerational actions of endocrine disrupters and mate
fertility. Science 2005;308(5727): 1466-1469.
Table 7. Highly Cited EDCs Papers in the Field of Pharmacology & Toxicology (top 1%)
No. of
Cites
144
155
171
First Author
Parks LG
Gray LE
Laws SC
Paper
The plasticizer diethylhexyl phthalate induces malformations by
decreasing fetal testosterone synthesis during sexual differentiation in
the male rat. Toxicological Sciences 2000;58(2):339-349.
Perinatal exposure to the phthalates DEHP, BBP, and DINP, but not
DEP, BMP, or DOTP, alters sexual differentiation of the male rat.
Toxicological Sciences 2000;58(2):350-365.
Estrogenic activity of octylphenol, nonylphenol, bisphenol A and
methoxychlor in rats. Toxicological Sciences 2000;54(1): 154-167.
Table 8. Very Highly Cited EDCs Papers (top 0.1%)
ESI Field
No. of
Cites
First Author
Paper
Environment/
Ecology
71
Swan SH
Decrease in anogenital distance among male infants with
prenatal phthalate exposure. Environmental Health Perspectives
2005;113(8):1056-1061.
Multidisciplinary
181
182
105
ZhuY
ZhuY
Anway MD
Identification, classification, and partial characterization of genes
in humans and other vertebrates homologous to a fish membrane
progestin receptor. Proceedings of the National Academy of
Sciences of the United States of America 2003;100(5):2237-
2242.
Cloning, expression, and characterization of a membrane
progestin receptor and evidence it is an intermediary in meiotic
maturation offish oocytes. Proceedings of the National
Academy of Sciences of the United States of America
2003;100(5):2231-2236.
Epigenetic transgenerational actions of endocrine disrupters and
mate fertility. Science 2005;308(5727): 1466-1469.
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
Table 9. Extremely Highly Cited EDCs Paper in the Field of
Multidisciplinary (top 0.01%)
No. of
Cites
181
182
105
First Author
ZhuY
ZhuY
Anway MD
Paper
Identification, classification, and partial characterization of genes in
humans and other vertebrates homologous to a fish membrane progestin
receptor. Proceedings of the National Academy of Sciences of the United
States of America 2003;100(5):2237-2242.
Cloning, expression, and characterization of a membrane progestin
receptor and evidence it is an intermediary in meiotic maturation offish
oocytes. Proceedings of the National Academy of Sciences of the United
States of America 2003; 100(5):223 1-2236.
Epigenetic transgenerational actions of endocrine disrupters and mate
fertility. Science 2005;308(5727): 1466-1469.
Ratio of Actual Cites to Expected Citation Rates
The expected citation rate is the average number of cites that a paper published in the same journal in
the same year and of the same document type (article, review, editorial, etc.) has received from the
year of publication to the present. Using the ESI average citation rates for papers published by field as
the benchmark, in 11 of the 15 fields in which the EPA EDCs papers were published, the ratio of
actual to expected cites is greater than 1, indicating that the EDCs papers are more highly cited than
the average papers in those fields (see Table 10). For all 15 fields combined, the ratio of total number
of cites to the total number of expected cites (8,997 to 4,582.3) is 2.0, indicating that the EDCs papers
are more highly cited than the average paper.
Table 10. Ratio of Actual Cites to Expected Cites for EDCs Papers by Field
ESI Field
Agricultural Sciences
Biology & Biochemistry
Chemistry
Clinical Medicine
Computer Science
Engineering
Environment/Ecology
Geosciences
Microbiology
Molecular Biology & Genetics
Total
Cites
18
961
247
1,124
37
2
2,284
3
1
32
Expected Cite
Rate
8.1
853.0
189.1
685.9
5.8
6.0
1,023.3
2.2
4.7
65.9
Ratio
2.2
1.1
1.3
1.6
6.4
0.3
2.2
1.4
0.2
0.5
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
ESI Field
Multidisciplinary
Neuroscience & Behavior
Pharmacology & Toxicology
Plant & Animal Science
Social Sciences, general
TOTAL
Total
Cites
776
213
2,552
731
16
8,997
Expected Cite
Rate
40.6
354.7
1,002.5
336.3
4.2
4,582.3
Ratio
19.1
0.6
2.5
2.2
3.8
2.0
JCR Benchmarks
Impact Factor. The JCR Impact Factor is a well known metric in citation analysis. It is a measure of
the frequency with which the "average article" in a journal has been cited in a particular year. The
Impact Factor helps evaluate a journal's relative importance, especially when compared to others in the
same field. The Impact Factor is calculated by dividing the number of citations in the current year to
articles published in the 2 previous years by the total number of articles published in the 2 previous
years.
Table 11 indicates the number ofEDCs papers published in the top 10% of journals, based on the JCR
Impact Factor. Two hundred thirteen (213) of 519 papers were published in the top 10% of journals,
representing 41.0% of EPA's EDCs papers. This indicates that nearly one-half of the EDCs papers are
published in the highest quality journals as determined by the JCR Impact Factor, which is 4.1 times
higher than the expected percentage.
Table 11. EDCs Papers in Top 10% of Journals by JCR Impact Factor
EPA EDCs
Papers in
that Journal
1
1
7
1
1
1
1
31
1
Journal
New England Journal of Medicine
Science
Proceedings of the National Academy of Sciences of the
United States of America
Development
Cancer Research
Human Reproduction Update
Nucleic Acids Research
Environmental Health Perspectives
Journal of Clinical Endocrinology and Metabolism
Impact
Factor
(IF)
51.296
30.028
9.643
7.764
7.656
6.793
6.317
5.861
5.799
JCR IF
Rank
2
9
116
165
172
202
222
255
261
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
EPA EDCs
Papers in
that Journal
4
1
12
1
2
1
8
1
3
1
18
1
3
11
74
1
1
19
1
1
1
3
Total = 213
Journal
Analytical Chemistry
American Journal of Epidemiology
Endocrinology
Journal of Medicinal Chemistry
Bioinformatics
Molecular Ecology
Toxicology and Applied Pharmacology
Cancer
Epidemiology
Hippocampus
Environmental Science & Technology
Physiological Genomics
Hormones and Behavior
Critical Reviews in Toxicology
Toxicological Sciences
Journal of Chromatography A
Applied and Environmental Microbiology
Biology of Reproduction
Neuroscience
Evolution & Development
Fertility and Sterility
Chemical Research in Toxicology
Impact
Factor
(IF)
5.646
5.241
5.236
5.115
4.894
4.825
4.722
4.582
4.339
4.232
4.040
3.789
3.789
3.707
3.598
3.554
3.532
3.498
3.427
3.293
3.277
3.162
JCR IF
Rank
276
308
310
328
358
374
397
413
452
478
518
593
593
623
662
678
682
694
721
770
111
818
Immediacy Index. The JCR Immediacy Index is a measure of how quickly the average article in a
journal is cited. It indicates how often articles published in a journal are cited within the year they are
published. The Immediacy Index is calculated by dividing the number of citations to articles published
in a given year by the number of articles published in that year.
Table 12 indicates the number ofEDCs papers published in the top 10% of journals, based on the JCR
Immediacy Index. Two hundred twenty-eight (228) of the 519 papers appear in the top 10% of
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
journals, representing 43.9% of the EDCs papers. This indicates that nearly one-half of the EDCs
papers are published in the highest quality journals as determined by the JCR Immediacy Index, which
is 4.4 times higher than the expected percentage.
Table 12. EDCs Papers in Top 10% of Journals by JCR Immediacy Index
EPA EDCs
Papers in that
Journal
1
1
2
7
1
1
3
1
1
12
1
1
1
1
31
1
3
11
1
3
1
4
4
19
74
Journal
New England Journal of Medicine
Science
ILAR Journal
Proceedings of the National Academy of Sciences of the
United States of America
Nucleic Acids Research
Development
Epidemiology
Cancer Research
Evolution & Development
Endocrinology
American Journal of Epidemiology
Hippocampus
Human Reproduction Update
Journal of Clinical Endocrinology and Metabolism
Environmental Health Perspectives
Environmental Science and Pollution Research
International Journal of Andrology
Critical Reviews in Toxicology
Journal of Medicinal Chemistry
Hormones and Behavior
American Zoologist
Integrative and Comparative Biology
Analytical Chemistry
Biology of Reproduction
Toxicological Sciences
Immediacy
Index
(II)
12.743
5.555
1.783
1.758
1.744
1.579
1.437
1.220
1.120
1.102
1.091
1.081
1.069
1.046
0.994
0.982
0.974
0.880
0.859
0.856
0.842
0.842
0.795
0.736
0.734
JCR II
Rank
2
16
121
126
131
157
187
246
287
298
306
309
317
333
373
376
379
442
461
466
480
480
524
593
597
10
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
EPA EDCs
Papers in that
Journal
1
1
2
1
3
18
1
1
1
1
1
3
8
Total = 228
Journal
Journal of Experimental Biology
Cancer
Bioinformatics
Molecular Ecology
Chemical Research in Toxicology
Environmental Science & Technology
Reproduction Fertility and Development
Applied and Environmental Microbiology
Physiological Genomics
Fertility and Sterility
Neuroscience
Pure and Applied Chemistry
Environmental Research
Immediacy
Index
(II)
0.719
0.713
0.712
0.666
0.663
0.646
0.641
0.634
0.616
0.612
0.611
0.586
0.583
JCRll
Rank
621
629
631
700
703
729
739
751
111
788
790
840
844
Hot Papers
ESI establishes citation thresholds for hot papers, which are selected from the highly cited papers in
different fields, but the time frame for citing and cited papers is much shorter—papers must be cited
within 2 years of publication and the citations must occur in a 2-month time period. Papers are
assigned to 2-month periods and thresholds are set for each period and field to select 0.1% of papers.
There were no hot papers identified for the current 2-month period (i.e., March-April 2007), but there
were a number of hot papers identified from previous periods.
Using the hot paper thresholds established by ESI as a benchmark, 4 hot papers, representing 0.8% of
the EDCs papers, were identified in two fields— Environment/Ecology and Multidisciplinary. The
number ofEDCs hot papers is 8 times higher than expected. The hot papers are listed in Table 13.
11
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
Table 13. Hot Papers Identified Using ESI Thresholds
Field
Environment/
Ecology
Multidisciplinary
ESI Hot
Papers
Threshold
3
4
5
9
No. of Cites
in 2-Month
Period
3 cites in
December
2003
12 cites in
February-
March 2006
6 cites in
February 2007
15 cites in
May-June
2006
Paper
Schreinemachers DM. Birth malformations and other
perinatal outcomes in four US wheat-producing states.
Environmental Health Perspectives 2003;! 1 1(9): 1259-1264.
Swan SH, et al. Decrease in anogenital distance among
male infants with prenatal phthalate exposure.
Environmental Health Perspectives 2005;! 13(8): 1056-1061.
LeBlanc GA. Crustacean endocrine toxicology: a review.
Ecotoxicology 2007;16(1):61-81.
Anway MD, et al. Epigenetic transgenerational actions of
endocrine disrupters and mate fertility. Science
2005;308(5727): 1466-1469.
Author Self-Citation
Self-citations are journal article references to articles from that same author (i.e., the first author).
Because higher author self-citation rates can inflate the number of citations, the author self-citation rate
was calculated for the EDCs papers. Of the 8,997 total cites, 418 are author self-cites—a 4.6% author
self-citation rate. Garfield and Sher3 found that authors working in research-based disciplines tend to
cite themselves on the average of 20% of the time. MacRoberts and MacRoberts4 claim that
approximately 10% to 30% of all the citations listed fall into the category of author self-citation.
Kovacic and Misak5 recently reported a 20% author self-citation rate for medical literature. Therefore,
the 4.6% self-cite rate for the EDCs papers is well below the range for author self-citation.
Highly Cited Researchers
A search of Thomson's ISIHighlyCited. com revealed that 17 (1.6%) of the 1,096 authors of the EDCs
papers are highly cited researchers. ISIHighlyCited.com is a database of the world's most influential
researchers who have made key contributions to science and technology during the period from 1981
to 1999. The highly cited researchers identified during this analysis of the EDCs publications are
presented in Table 14.
Garfield E, Sher IH. New factors in the evaluation of scientific literature through citation indexing. American
Documentation 1963;18(July):195-210.
4 MacRoberts MH, MacRoberts BR. Problems of citation analysis: a critical review. Journal of the American Society of
Information Science 1989;40(5):342-349.
5 Kavaci N, Misak A. Author self-citation in medical literature. Canadian Medical Association Journal
2004;170(13):1929-1930.
12
-------
Bibliometric Analysis ofEDCs Research Program Journal Articles
Table 14. Highly Cited Researchers Authoring EDCs Publications
Highly Cited
Researcher
Andersen, Melvin E.
Ankley, Gerald
Birnbaum, Linda S.
Boobis, Alan R.
Brown, Sandra
Burger, Joanna
German, J. Bruce
Giesy, John P.
Guillette, Louis J.
Jobling, Susan
McLachlan, John A.
Needham, Larry L.
Pace, Michael L.
Rao, P. Suresh
Chandra
Sih, Andrew
Suidan, Makram T.
Sumpter, John P.
Total = 17
Affiliation ESI Field
CUT Centers for Health Research
U.S. Environmental Protection
Agency
U.S. Environmental Protection
Agency
Imperial College London
Winrock International
Rutgers University
University of California-Davis
University of Saskatchewan
University of Florida
University of Brunei
Tulane University
National Center for Environmental
Health
Institute of Ecosystem Studies
Purdue University
University of California-Davis
University of Cincinnati
Brunei University
Pharmacology
Environment/Ecology
Pharmacology
Pharmacology
Environment/Ecology
Environment/Ecology
Agricultural Sciences
Environment/Ecology
Environment/Ecology
Environment/Ecology
Environment/Ecology
Environment/Ecology
Plant & Animal Science
Environment/Ecology
Environment/Ecology
Environment/Ecology
Environment/Ecology
Patents
No patents have been issued or patent applications filed by investigators from 1997 to 2007 for
research that was conducted under EPA's EDCs research program.
This bibliometric analysis was prepared by
Beverly Campbell of The Scientific Consulting Group, Inc.
in Gaithersburg, Maryland
under EPA Contract No. EP-C-05-015
13
------- |