Top countries for Gastroenterology & Hepatology

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Which countries have the most top-cited scientists in Gastroenterology & Hepatology?

2,352 researchers whose main subfield is Gastroenterology & Hepatology are in the 2026 list of top-cited scientists, the annual ranking often called the Stanford–Elsevier top 2% scientists list. The United States has the most (767, 32.6%), followed by Italy (205) and the United Kingdom (144). A country with 100 or more opens its institutions in the subfield; the others open their scientists in the table of all authors.

#	Country	Listed authors	Top 100k	Share of subfield	Highest-ranked author	Top institution
1	United States	767	377	32.6%	Younossi, Zobair M. #82	Mayo Clinic
2	Italy	205	76	8.7%	Danese, Silvio #1,015	Alma Mater Studiorum Università di Bologna
3	United Kingdom	144	55	6.1%	Byrne, Christopher D. #2,729	King's College London
4	Japan	136	47	5.8%	Kudo, Masotoshi #238	Graduate School of Medicine
5	Germany	114	44	4.8%	Neurath, Markus Friedrich #304	Charité – Universitätsmedizin Berlin
6	France	96	49	4.1%	Harrison, Stephen A. #1,411	Université Paris Cité
7	Canada	94	42	4.0%	Kaplan, Gilaad G. #680	University of Alberta
8	China	94	20	4.0%	Fan, Jiangao #8,579	Tongji Medical College of Huazhong University of Science and Technology
9	Spain	79	39	3.4%	Llovet, Josep M. #528	Universitat de Barcelona
10	Australia	62	25	2.6%	Talley, Nicholas J. #3,119	Monash University
11	South Korea	59	14	2.5%	Park, Joongwon #6,372	Seoul National University College of Medicine
12	Netherlands	54	19	2.3%	D'Haens, Geert R.A.M. #2,924	Erasmus MC
13	Belgium	50	27	2.1%	Vermeire, Sèverine A.R.A. #3,081	Departement Chronische Ziekten, Metabolisme en Veroudering
14	India	43	16	1.8%	Sarin, Shiv Kumar #4,594	Postgraduate Institute of Medical Education and Research, Chandigarh
15	Switzerland	34	13	1.4%	Rogler, Gerhard #4,728	UniversitatsSpital Zurich
16	Denmark	33	16	1.4%	Burisch, Johan #15,601	Odense Universitetshospital
17	Sweden	30	15	1.3%	Ludvigsson, Jonas Filip #702	Karolinska Institutet
18	Hong Kong	29	22	1.2%	Ng, S. C. #1,926	Chinese University of Hong Kong
19	Austria	27	13	1.1%	Tilg, Herbert #863	Medizinische Universität Wien
20	Taiwan	27	6	1.1%	Kao, Jia Horng #15,418	National Taiwan University Hospital
21	Israel	22	11	0.9%	Levitt, Michael D. #10,575	Tel Aviv University
22	Greece	18	5	0.8%	Papatheodoridis, George V. #25,843	National and Kapodistrian University of Athens
23	Poland	12	3	0.5%	Szajewska, Hania #10,513	Medical University of Warsaw
24	Singapore	11	4	0.5%	Huang, Daniel Qingyao Y. #16,663	National University Hospital
25	Finland	11	2	0.5%	Åberg, Fredrik O. #34,124	Helsingin Yliopisto
26	Portugal	8	4	0.3%	MacHado, Mariana Verdelho #17,544	Faculdade de Medicina da Universidade do Porto (FMUP)
27	Iran	7	1	0.3%	Zali, Mohammad Reza #61,682	Shahid Beheshti University of Medical Sciences
28	Türkiye	6	1	0.3%	Yilmaz, Yusuf #12,891	Recep Tayyip Erdogan University
29	New Zealand	6	4	0.3%	Petrov, Maxim S. #13,278	University of Auckland
30	Norway	6	2	0.3%	Karlsen, Tom Hemming #24,894	Universitetet i Oslo
31	Saudi Arabia	6	2	0.3%	Alqahtani, Saleh A. #35,620	King Saud University
32	Thailand	6	0	0.3%	Bunchorntavakul, Chalermrat #149,689	Faculty of Medicine, Chulalongkorn University
33	Ireland	5	3	0.2%	Shanahan, Fergus L. #7,920	APC Microbiome Ireland
34	Malaysia	5	3	0.2%	Chan, Wah Kheong #15,294	Universiti Malaya
35	Russia	5	1	0.2%	Swidsinski, Alexander V. #87,669	Sechenov First Moscow State Medical University
36	Egypt	5	2	0.2%	Abd-Elsalam, Sherief M. #94,674	Tanta University
37	Argentina	4	3	0.2%	Sookoian, Silvia C. #14,729	Consejo Nacional de Investigaciones Científicas y Técnicas
38	Mexico	4	1	0.2%	Méndez-Sánchez, Nahúm #59,178	Fundacion Clinica Medica Sur
39	Romania	4	0	0.2%	Saftoiu, Adrian #121,248	Universitatea de Medicina si Farmacie Carol Davila din Bucuresti
40	Hungary	3	3	0.1%	Lakatos, Péter László #39,478	Semmelweis Egyetem
41	Brazil	3	0	0.1%	Kotze, Paulo Gustavo #119,131	Pontifícia Universidade Católica do Paraná
42	Chile	2	1	0.1%	Arab, Juan Pablo #23,912	Pontificia Universidad Católica de Chile
43	South Africa	2	2	0.1%	Kew, Michael Charles #44,778	Faculty of Health Sciences, University of Cape Town
44	Croatia	2	1	0.1%	Hojsak, Iva #51,977	Childern's Hospital Zagreb
45	Lebanon	2	1	0.1%	Hashash, Jana G. #88,267	American University of Beirut
46	Indonesia	2	0	0.1%	Miftahussurur, Muhammad #167,488	Universitas Airlangga
47	Iceland	1	1	0.0%	BjÖrnssÖn, Einar Stefán #3,527	Landspitali - The National University Hospital of Iceland
48	Czechia	1	1	0.0%	Vitek, Libor #20,266	Všeobecná Fakultní Nemocnice v Praze
49	United Arab Emirates	1	1	0.0%	Annese, Vito #34,141	United Arab Emirates University
50	Latvia	1	1	0.0%	Leja, Mārcis #43,039	Digestive Diseases Centre GASTRO
51	Estonia	1	1	0.0%	Forbes, Alastair #59,546	Tartu Ülikool
52	Puerto Rico	1	1	0.0%	Navaneethan, Udayakumar #60,177	Orlando Health
53	Lithuania	1	0	0.0%	Kupcinskas, J. #258,535	Lietuvos Sveikatos Mokslų Universitetas
54	Sri Lanka	1	0	0.0%	Rajindrajith, Shaman #297,641	Lady Ridgeway Hospital for Children