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Worldwide research productivity in the field of endocrinology and metabolism - A bibliometric analysis
Article in Endokrynologia Polska · October 2015
DOI: 10.5603/EP.2015.0054
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Prace oryginalne/Original papers
Endokrynologia Polska
DOI: 10.5603/EP.2015.0054
Tom/Volume 66; Numer/Number 5/2015
ISSN 0423–104X
Worldwide research productivity in the field
of endocrinology and metabolism — a bibliometric analysis
Światowa produktywność badań w dziedzinie endokrynologii i metabolizmu — analiza bibliometryczna
Xiyan Zhao1, 2, Ru Ye1,2, Linhua Zhao1, Yiqun Lin1, 2, Wenjing Huang1, Xinhui He1, 2, Fengmei Lian1, Xiaolin Tong1
1Department of Endocrinology, Guang’anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China
2Graduate School, Beijing University of Chinese Medicine, Beijing, China
Abstract
Introduction: Recently, significant contributions to the study of endocrinology and metabolism have been made. The national contribu-tion, however, has not been reported. The aim of this study was to assess national efforts in the field of endocrinology and metabolism. Material and methods: A Web of Science search was performed using subject categories “endocrinology & metabolism” to identify articles published from 2010 to 2014. The total and per capita numbers of articles and citations were analysed for different countries.
Results: A total of 79,394 articles were published on endocrinology and metabolism from 2010 to 2014. Most were published in North America, East Asia, and Europe. The majority (82.28%) were reported by authors in high-income countries, 17.64% were published in middle-income countries, and only 0.08% were published in low-income countries. Authors in the United States published the most articles (27.38%), followed by China (7.22%), Italy (5.70%), the United Kingdom (5.6%), and Japan (5.54%). Articles published by authors in the United States had the most citations (260,934). A positive correlation was found between the number of publications and population/gross domestic product (GDP; p < 0.01). When normalised to population size, the ranking for the most publications was Denmark, Sweden, and the Netherlands; when normalised to GDP, the ranking was Denmark, Greece, and the Netherlands.
Conclusions: The majority of endocrinology and metabolism articles were published by authors from high-income countries with few from low-income countries. The United States was the most productive country. However, when population size and GDP were considered, some European countries were ranked higher. (Endokrynol Pol 2015; 66 (5): 434–442)
Key words: endocrinology; metabolism; bibliometric analysis; literature
Streszczenie
Wstęp: Ostatnio pojawiło się wiele znaczących publikacji na temat badań z dziedziny endokrynologii i metabolizmu. Narodowy wkład na tym polu został jednak pominięty. Celem niniejszego badania była ocena krajowych badań w dziedzinie endokrynologii i metabolizmu. Materiał i metody: Wyszukiwanie za pomocą Web of Science przeprowadzono z wykorzystaniem kategorii podmiotowych „endokryno-logia i metabolizm”, aby zidentyfikować artykuły opublikowane w latach 2010–2014. Analizie poddano łączną liczbę artykułów i cytowań, a także ich liczbę przypadającą na osobę w odniesieniu do różnych krajów.
Wyniki: W latach 2010–2014 opublikowano łącznie 79 394 artykułów na temat endokrynologii i metabolizmu. Większość artykułów po-chodziła z Ameryki Północnej, Azji Wschodniej i Europy. Większość artykułów (82,28%) napisali autorzy z krajów o wysokich dochodach, 17,64% opublikowano w krajach średnio zamożnych, a jedynie 0,08% artykułów opublikowano w krajach o niskich dochodach. Najwięcej artykułów publikowali autorzy ze Stanów Zjednoczonych (27,38%), następnie z Chin (7,22%), Włoch (5,70%), Wielkiej Brytanii (5,6%) i Japonii (5,54%). Prace publikowane przez amerykańskich autorów zawierały największą liczbę cytowań (260 934). Stwierdzono pozy-tywny związek między liczbą publikacji i populacją/produktem krajowym brutto (PKB; p < 0,01). Po unormalizowaniu do liczebności populacji, w rankingu krajów o najwyższej liczbie publikacji znalazły się Dania, Szwecja oraz Holandia. Gdy znormalizowano wyniki pod względem PKB, w rankingu znalazły się Dania, Grecja oraz Holandia.
Wnioski: Większość artykułów z dziedziny endokrynologii i metabolizmu została opublikowana przez autorów z krajów o wysokich dochodach; w krajach o niskich dochodach ukazało się niewiele artykułów. Stany Zjednoczone wykazały największą produktywność, jednak kiedy brano pod uwagę liczebność populacji i PKB, niektóre kraje europejskie zajmowały wyższą pozycję. (Endokrynol Pol 2015; 66 (5): 434–442)
Słowa kluczowe: endokrynologia; metabolizm; analiza bibliometryczna; literatura
This work was supported by the National “Twelfth Five-Year” Plan for Science & Technology (2013BAI02B10).
Introduction
In recent years, the field of endocrinology and metabolism have grown significantly [1, 2]. This has been a worldwide effort; however, some countries have contributed more
than others. It should not be expected that each country produce the same amount of publications because differ-ent countries have very different capabilities in terms of financial research resources, scientific research programs, and established healthcare systems [3, 4].
Xiaolin Tong M.D., Fengmei Lian M.D., Department of Endocrinology, Guang’anmen Hospital, China Academy of Chinese Medical Sciences. No.5 Beixiange Street, Xicheng District, Beijing 100053, China, e-mail: xiaolintong_66@126.com (X. Tong); lfm0226@sohu.com (F. Lian)
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Scientific progress can be assessed according to the number of publications that are produced by scientific research groups. Progress in the field of endocrinology and metabolism worldwide can be analysed by assess-ing the numbers of publications produced by authors in different countries. Also, bibliometric analysis can be used to investigate trends in scholarly publications and the relative importance of articles on a specific topic. Bibliometric analysis has been used to determine national contributions to research fields including oncology [4], cardiovascular disease [5], rheumatology [6], nutrition and dietetics [7], diabetic retinopathy [8], emergency medicine [9], critical care medicine [10], anaesthesia [11], plastic and reconstructive surgery [12], foot and ankle research [13], and arthroscopy [14].
Research productivity in the field of endocrinol-ogy and metabolism, however, has not been assessed to date. The aim of this study was to analyse research productivity worldwide to uncover national differences in contributions to the study of endocrinology and metabolism from 2010 to 2014.
Material and methods
In Journal Citation Reports (JCR) for the year 2013 established by the Institute for Scientific Information
[15] a total of 124 journals in the subject categories of “endocrinology & metabolism” were included in this study (Supplement 1).
The Web of Science database was searched on 8 April 2015 to identify publications in the field of endocrinol-ogy and metabolism. The Web of Science is the world’s leading database for scientific publications, and citations and other academic impact information is included in this database, which makes it a widely used source for studies on scientific productivity [7–10, 12]. Articles published in 124 journals from January 2010 to Decem-ber 2014 were identified. The search was conducted for original articles and reviews, and articles that were let-ters, editorials, or corrections were excluded. The titles of the journals were used to perform a literature search in Web of Science. For each article, the source nation was considered as the nation of the institutional affiliation, unless there was more than one institution, in which case the institution of the corresponding authors was considered as the source nation.
Quantification of research productivity was based on the number of published articles. The total number of citations of some articles was a quality indicator.
The primary outcome of the study was the number of original articles originating from each country. Countries were then ranked according to their pro-ductivity as expressed by the number of publications. Countries were labelled as high income, upper mid-
dle income, lower middle income, and low income according to the categories set by the World Bank
[16]. Gross national income per capita determined the income levels, and $12,746 or more was considered high income, $4,125 to $12,745 was considered upper middle income, $1,046 to $4,125 was considered lower middle income, and $1,045 or less was considered low income. The percentages of articles for each category were then calculated.
Countries producing at least 1% of the total publica-tions were considered as the main productive countries, and further analysis of these countries was performed including the total number of publications, publica-tions per capita, total citations (the number of articles multiplied by the number of citations), and the mean citation number. Statistics on population sizes and gross domestic product (GDP) from the Central Intelligence Agency of the United States and the Word Bank for the most recent report were used in the study [17]. The top five countries in terms of publications and the top five journals were listed.
Since we were not employing hypothesis testing but were only describing trends, only descriptive statistics were used, e.g. sum, average, and percentage. A Spear-man’s test was used for correlation analysis [10,13,14]. SPSS version 19.0 (SPSS Inc., Chicago, IL, USA) was used for all statistical analyses and p < 0.05 was considered as significant.
Results
In the years 2010–2014 the total number articles on en-docrinology and metabolism identified in the database of Web of Science was 79,394. In 2010 14,905 articles were published, and in 2014 16,201 articles were published. This was a 1.09-fold increase in the publication rate.
Based on the number of publications, 124 countries contributed to the science of endocrinology and me-tabolism. Authors in the United States published the most articles (21,740/79,394, or 27.38%), authors in China published the second most (5,736/79,394, or 7.22%), and this was followed by Italy (4,529/79,394, or 5.70%), the United Kingdom (4,446/79,394, or 5.60%), and Japan (4,397/79,394, or 5.54%). Figure 1 shows the produc-tive regions on a world map, and North America, East Asia, and Europe are clearly most prominent. A total of 65,323 (82.28%) articles were published in high-income countries, 14,006 (17.64%) articles were published in high middle- and low middle-income countries com-bined, and only 65 (0.08%) articles were published in low-income countries (Fig. 2). There was a significant correlation (p < 0.01) between the number of publi-cations and population size and GDP (r = 0.442 and r = 0.834, respectively, Fig. 3).
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Figure 1. World map of the worldwide research productivity 2010 to 2014
Rycina 1. Mapa świata ukazująca światową produktywność badań w latach 2010–2014
2.15% 0.08% High income
Upper-midle income
15.49% Lower-middle income
Low income
82.28%
Figure 2. Publications grouped by gross national income 2010 to 2014
Rycina 2. Publikacje pogrupowane według produktu krajowego brutto w latach 2010–2014
Twenty-one countries were seen as main productive countries (producing at least 1% of the total number of articles). These 21 countries published 70,782 of the 79,394 (89.15%) articles (Table I). Of all the main pro-ductive countries, the United States had the highest number of citations (260,934); the United Kingdom had 52,068 citations, and Italy had 37,340 citations. Regard-ing the mean number of citations, the ranking was as follows: the United States (12), the United Kingdom (11.71), and Switzerland (11.67). Most of the articles had authors from high-income countries (17). Upper middle-income countries were the second, twelfth, and sixteenth (China, Brazil, and Turkey, respectively) ranked nations. India, which is a lower middle-income country, was the 18th ranked nation.
Denmark produced the highest number of publi-cations per million population (249.95), Sweden had
25000 25000
ofarticles 20000 ofarticles 20000
15000 15000
Number 10000 Number 10000
5000 5000
0 0
1200 1400 1600 15000 20000
0 200 400 600 800 1000 0 5000 10000
Population GDP
Figure 3. Scatter plot showing the association of publication activity in the field of endocrinology and metabolism with population and GDP from different countries
Rycina 3. Wykres punktowy ilustrujący związek aktywności publikacji w dziedzinie endokrynologii i metabolizmu z populacją i PKB dla różnych krajów
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Table I. Publications in the most productive countries 2010 to 2014
Tabela I. Publikacje w najbardziej produktywnych krajach od 2010 do 2014 roku
Country N % N per million N per 10 billion Total citation Mean citation
population US $ GDP
USA 21740 27.38% 68.17 12.94 260934 12.00
China 5736 7.22% 4.16 6.03 32920 5.74
Italy 4529 5.70% 73.43 21.87 37340 8.24
UK 4446 5.60% 69.75 17.63 52068 11.71 ORYGINALNE
Japan 4397 5.54% 34.59 8.97 28894 6.57
Germany 4158 5.24% 51.34 11.44 37052 8.91
Canada 3193 4.02% 91.66 17.48 30757 9.63
France 2774 3.49% 41.87 10.14 22885 8.25
Australia 2538 3.20% 112.76 16.26 28165 11.10 PRACE
Spain 2117 2.67% 44.35 15.59 18524 8.75
Netherlands 2143 2.70% 126.97 26.78 23657 11.04
Brazil 2099 2.64% 10.36 9.35 9458 4.51
South Korea 1754 2.21% 35.77 13.45 11686 6.66
Sweden 1483 1.87% 152.51 26.53 14832 10.00
Denmark 1392 1.75% 249.95 42.10 13952 10.02
Turkey 1307 1.65% 16.01 15.94 4697 3.59
Poland 1277 1.61% 33.30 24.67 4425 3.47
India 1240 1.56% 1.00 6.61 6551 5.28
Switzerland 841 1.06% 104.32 12.93 9811 11.67
Greece 825 1.04% 76.56 34.13 5056 6.13
Belgium 793 1.00% 75.89 15.61 9193 11.59
N — number, GDP — gross domestic product
152.51 publications per million population, and the Netherlands had 126.97. When GDP was considered, Denmark ranked the highest with 42.10 publications, Greece had 34.13, and the Netherlands had 26.78. After adjustment for GDP, the United States, China, and Japan ranked relatively low, even though they have
large economies.
Table II shows the publications from the five top ranked countries. The most popular journal for the United States was the Journal of Clinical Endocrinology
& Metabolism; the most popular journal for China was Biological trace Element Research, and the Journal of Endocrinological Investigation was popular in Italy.
The journal Diabetic Medicine was the most popular in the United Kingdom, and Endocrine Journal was popular in Japan. The Journal of Clinical Endocrinol-ogy & Metabolism was popular in three of the top five countries.
The top five journals and the five most productive countries are listed in Table Ⅲ. Regarding publication in the top five journals, the United States was most productive. Also, the United States was one of the top
five countries represented in the top five journals. The United Kingdom was one of the top five countries rep-resented in four of the five top journals, and Italy was represented in three of the five top journals.
Discussion
Developments in science and technology have pro-duced great advances in the field of endocrinology and metabolism, and the scientific contributions to this advancement have been from researchers throughout the world. Scientific publications report new knowledge in the field and also indicate the productivity of the researchers. Bibliometric methods can be used to evaluate research productivity, and contributions from various areas in the world can be assessed [4–14]. Our study was the first to use bibliometric evaluation to analyse the contributions of various countries to research in endocrinology and metabolism.
We found that authors in the United States pub-lished the greatest number of articles on endocrinology
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Table II. Ranking journals in the top 5 countries
Tabela II. Ranking czasopism w pięciu krajach zajmujących najwyższe pozycje w rankingu
Rank United States (21740) China (5736) Italy (4529) UK(4446) Japan (4397)
1 JCEM (1375) Biol Trace Elem Res (566) J Endocrinol Invest (367) Diabetic Med (332) Endocr J (472)
2 Endocrinology (1085) Diabetes Res Clin Pr (220) JCEM (288) JCEM (285) J Endocrinol Invest (246)
3 Obesity (1078) Free Radical Bio Med (200) Nutr Metab Cardiovas (256) Clin Endocrinol (195) Endocrinology (193)
4 Diabetes Care (1053) Endocrine (179) J Biol Reg Homeos Ag (240) Diabetologia (194) J Bone Miner Metab (166)
5 Diabetes (812) Mol Cell Endocrinol (163) Eur J Endocrinol (182) Diabetes Care (185) Gen Comp Endocr (148)
JCEM — Journal Of Clinical Endocrinology & Metabolism; Biol Trace Elem Res — Biological Trace Element Research; Diabetes Res Clin Pr — Diabetes Research And Clinical Practice; Free Radical Bio Med — Free Radical Biology And Medicine; Mol Cell Endocrinol — Molecular And Cellular Endocrinology; J Endocrinol Invest
— Journal Of Endocrinological Investigation; Nutr Metab Cardiovas — Nutrition Metabolism And Cardiovascular Diseases;J Biol Reg Homeos Ag — Journal Of Biological Regulators And Homeostatic Agents; Eur J Endocrinol — European Journal Of Endocrinology; Diabetic Med — Diabetic Medicine; Clin Endocrinol — Clinical Endocrinology; Endocr J — Endocrine Journal; J Bone Miner Metab — Journal Of Bone And Mineral Metabolism; Gen Comp Endocr — General And Comparative Endocrinology; UK — United Kingdom
Table III. Top 5 countries in the top 5 journals
Tabela III. Ranking krajów według pięciu najlepszych czasopism
Rank JCEM (3895) Diabetes Care (2476) Endocrinology (2467) Free Radical Bio Med (2013) Obesity (1895)
1 United States (1375) United States (1053) United States (1085) United States (770) United States (1078)
2 Italy (288) United Kingdom (185) Japan (193) China (200) Canada (89)
3 United Kingdom (285) Italy (146) Canada (168) Italy (90) United Kingdom (71)
4 France (210) Netherlands (113) United Kingdom (138) Japan (89) Australia (70)
5 Netherlands (205) Canada (111) Australia (125) Germany (81) Netherlands (67)
JCEM — Journal Of Clinical Endocrinology & Metabolism; Free Radical Bio Med — Free Radical Biology And Medicine
and metabolism compared to other countries. This result indicates that the United States plays an impor-tant role in scientific endeavours on endocrinology and metabolism. The United States has been a leader in biomedical research for decades, including endocrinol-ogy metabolism as well as other subfields in biomedical research [9–14].
In addition to producing the most articles overall, articles from the United States have the most citations (260,934) of endocrinology and metabolism publica-tions, as well as one of the highest mean number of citations (12). This suggests that the United States is very productive but also produces high quality pub-lications. The per capita number of articles produced in the United States is also very high (68.17 per million persons). The results of our study demonstrated that the United States is the most productive country in the world in the field of endocrinology and metabolism.
A “10/90” divide has been used to describe the ratio of contributions from non-high- versus high-income countries [18]. This ratio has been identified in many medical fields [9–12]. In our study, we found a slightly higher proportion for middle-income countries. This difference may be attributed to four middle-income
countries, i.e. China, Brazil, Turkey, and India [5, 9, 11]. An increasing importance in biomedical research has been recognised for these countries [9, 11, 19, 20]. The significant development that has occurred in these middle-income countries should be recognised [9, 11]. With further economic development, these countries could improve their rank in the future by improving their endocrinology and metabolism research. Gov-ernment policy, poor medical infrastructure, lack of research funds, and few researchers may be the root causes of poor research productivity in endocrinology and metabolism in low-income countries, which only produced 65 articles during the period of this study.
Some European countries, such as Denmark, Swe-den, the Netherlands, and Greece, were seen to be very productive when the results were normalised to population size and GDP. The productive countries are nearly all developed. Although China is the second productive country in the number of total articles, the number per million population is rather small, which is followed by India. This indicates that the relative productivity remains very low in these countries and further growth is needed. It may be more informative to normalise by the number of researchers in each country
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rather than population size, but it is very difficult to obtain information on the number of researchers in the field of endocrinology and metabolism in each country.
For the five top ranked countries, the most popular journal in the United States was the Journal of Clinical Endocrinology & Metabolism, for Italy it was the Journal of Endocrinological Investigation, for the United Kingdom it was Diabetic Medicine, and for Japan it was Endocrine Journal. Each of these journals is published in the as-sociated country, which means that there are probably more submissions from researchers in that country. Both the United States and the United Kingdom were represented at least four times as of the top five coun-tries in the top five journals. This indicated the influ-ence of these countries in the field of endocrinology and metabolism.
This study had some limitations. The first limita-tion is the inclusion of medical journals based on JCR criteria. Non-JCR-cited journals were not included in the article search, even though non-JCR-cited journal articles contributed to scientific production. Second, basic science and general internal medicine journals in categories of the JCR other than “endocrinology & metabolism” may have published endocrinology and metabolism-related articles, but they were not included in this study. However, our bibliometric analysis in-cluded 124 endocrinology and metabolism journals, and these journals represent the major journals reporting research in the field of endocrinology and metabolism.
Conclusions
In summary, we evaluated the national research pro-ductivity in the field of endocrinology and metabolism during a five-year recent period in this study. The results of the present study showed that the major-ity of publications were published by high-income countries, while relatively few publications were from low-income countries. When considering the number of publications produced overall, the United States is the most productive country in the world regarding endocrinology and metabolism. However, when the results were normalised to population size and GDP, some European countries might be considered to be more productive.
Acknowledgement
We would like to thank Zhiwei Jia and Yaohong Wu from the Navy General Hospital, Beijing, China for modifying the manuscript.
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Supplement 1. List of considered journals under the topic heading “endocrinology & metabolism” on Web of Science
Suplement 1. Lista rozpatrywanych czasopism pod względem nagłówka tematycznego „endoktynologia i metabolizm” w Web of Science
Journals
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Acta Diabetologica
Acta Endocrinologica-Bucharest
Aging Male
American Journal of Physiology-Endocrinology and Metabolism Annales D Endocrinologie
Annals of Nutrition and Metabolism
Antioxidants & Redox Signaling
Arquivos Brasileiros de Endocrinologia e Metabologia
Best Practice & Research Clinical Endocrinology & Metabolism Biofactors
Biological Trace Element Research
BMC Endocrine Disorders
Bone
Calcified Tissue International
Canadian Journal of Diabetes
Cardiovascular Diabetology
Cell Metabolism
Clinical Endocrinology
Comparative Biochemistry and Physiology C-Toxicology &
Pharmacology
Correspondances en Metabolismes Hormones Diabetes et Nutrition
Current Diabetes Reports
Current Opinion in Clinical Nutrition and Metabolic Care
Current Opinion in Endocrinology Diabetes and Obesity
Current Opinion in Lipidology
Diabetes & Metabolism
Diabetes & Vascular Disease Research
Diabetes Care
Diabetes Educator
Diabetes Obesity & Metabolism
Diabetes Research and Clinical Practice
Diabetes Stoffwechsel und Herz
Diabetes Technology & Therapeutics
Diabetes
Diabetes-Metabolism Research and Reviews
Diabetic Medicine
Diabetologe
Diabetologia
Diabetologie und Stoffwechsel
Diabetology & Metabolic Syndrome
Domestic Animal Endocrinology
Endocrine Journal
Endocrine Pathology
Endocrine Practice
Endocrine Research
Endocrine Reviews
Endocrine
Endocrine-Related Cancer
Endocrinology
Endocrinology and Metabolism Clinics of North America
Endokrynologia Polska
European Journal of Endocrinology
Experimental and Clinical Endocrinology & Diabetes
Experimental Diabetes Research
Free Radical Biology and Medicine
Frontiers in Neuroendocrinology
Frontiers of Hormone Research
General and Comparative Endocrinology
Growth Factors
Growth Hormone & IGF Research
Gynecological Endocrinology
Hormone and Metabolic Research
Hormone Research in Paediatrics
Hormones and Behavior
Hormones-International Journal of Endocrinology and Metabolism
International Journal of Diabetes in Developing Countries
International Journal of Endocrinology
International Journal of Obesity
Islets
Journal of Biological Regulators and Homeostatic Agents
Journal of Bone and Mineral Metabolism
Journal of Bone and Mineral Research
Journal of Cerebral Blood Flow and Metabolism
Journal of Clinical Densitometry
Journal of Clinical Endocrinology & Metabolism
Journal of Diabetes
Journal of Diabetes and its Complications
Journal of Diabetes Investigation
Journal of Diabetes Research
Journal of Endocrinological Investigation
Journal of Endocrinology
Journal of Inherited Metabolic Disease
Journal of Mammary Gland Biology and Neoplasia
Journal of Molecular Endocrinology
Journal of Neuroendocrinology
Journal of Pediatric Endocrinology & Metabolism
cd. →
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Endokrynologia Polska 2015; 66 (5)
Supplement 1 (cd.). List of considered journals under the topic heading “endocrinology & metabolism” on Web of Science
Suplement 1 (cd.). Lista rozpatrywanych czasopism pod względem nagłówka tematycznego „endoktynologia i metabolizm” w Web of Science
Journals
Journal of Pineal Research
Journal of Steroid Biochemistry and Molecular Biology Journal of Trace Elements in Medicine and Biology Magnesium Research
Metabolic Brain Disease
Metabolism-Clinical and Experimental
Metabolomics
Minerva Endocrinologica
Molecular and Cellular Endocrinology
Molecular Endocrinology
Nature Reviews Endocrinology
Neuroendocrinology Letters
Neuroendocrinology
Neuroimmunomodulation
Neuropeptides
Nutrition & Diabetes
Nutrition Clinique et Metabolisme
Nutrition Metabolism and Cardiovascular Diseases Obesity and Metabolism-Milan Obesity Facts
Obesity Research & Clinical Practice
Obesity Reviews
Obesity
Osteoporosis International
Pediatric Diabetes
Pituitary
Primary Care Diabetes
Prostaglandins Leukotrienes and Essential Fatty Acids
Prostate
Psychoneuroendocrinology
Regulatory Peptides
Reproductive Biology and Endocrinology
Reviews in Endocrine & Metabolic Disorders
Steroids
Stress:
The International Journal on the Biology of Stress
Thyroid
Trace Elements and Electrolytes
Trends in Endocrinology and Metabolism
Vitamins and Hormones
PRACE ORYGINALNE
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