1. Department of Gastroenterology, Biodonostia Health Research Institute, San Sebastián; CIBERehd, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid; Department of Medicine, Universidad Del País Vasco (UPV/EHU), San Sebastián, Spain;
2. Gastroenterology Department, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa (IIS-Princesa), Universidad Autónoma de Madrid (UAM), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain;
3. Department of Pancreatic, Biliary and Upper Digestive Tract Disorders, A. S. Loginov Moscow Clinical Scientific Center, Moscow; Department of Propaedeutic of Internal Diseases and Gastroenterology, A.I. Yevdokimov Moscow State University of Medicine and Dentistry, Moscow; Department of Outpatient Therapy and Family Medicine, Tver State Medical University, Tver, Russia;
4. Department of Gastroenterology, DC Rogaska, Slatina, Slovenia;
5. Digestive Unit, Agencia Sanitaria Costa Del Sol, Marbella, Spain;
6. Department of Medical and Surgical Sciences, IRCCS St. Orsola Polyclinic, University of Bologna, Bologna, Italy;
7. Aparato Digestivo, Hospital Universitario de Valme, Sevilla, Spain;
8. Department of Gastroenterology, Østfold Hospital Trust, Grålum, Norway;
9. Gastro, Digestive Diseases Centre, Riga; Institute of Clinical and Preventive Medicine, University of Latvia, Riga, Latvia;
10. Gastroenterology, University of Oviedo, Oviedo, Spain;
11. Gastroenterology Clinic, Henry Dunant Hospital, Athens, Greece;
12. Institute for Digestive Research and Department of Gastroenterology, Lithuanian University of Health Sciences, Kaunas, Lithuania;
13. Department of Gastroenterology, Internal Medicine, National Medical University, Kyiv, Ukraine;
14. Medicina Interna e Gastroenterologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Roma, Italy;
15. Department of Gastroenterology, Hacettepe University, Ankara; Department of Gastroenterology, HC International Clinic, Ankara, Turkey;
16. Department of Digestive Disorders, Aberdeen Royal Infirmary, Aberdeen, UK;
17. Gastroenterology, Ferencváros Health Center, Budapest, Hungary;
18. 3S–Instituto de Investigação e Inovação Em Saúde da Universidade Do Porto, Porto; Ipatimup–Instituto de Patologia e Imunologia Molecular da Universidade Do Porto, Porto; Pathology, FMUP–Faculdade de Medicina Do Porto, Porto, Portugal;
19. Division of Gastroenterology, Rabin Medical Center, PetahTikva; Sackler School of Medicine, Tel Aviv University, TelAviv, Israel;
20. Department of Medical Microbiology, Medical University of Sofia, Sofia, Bulgaria;
21. Department of Gastroenterology, University Hospital of Split, Split, Croatia;
22. Department of Gastroenterology, Pomeranian Medical University in Szczecin, Szczecin; The Centre for Digestive Diseases, Endoklinika, Szczecin, Poland;
23. Department of Gastroenterology, Hepatology and Infectious Diseases, University Hospital of Magdeburg, Magdeburg, Germany;
24. Gastrocenter, Perm, Russia;
25. L.T. Malaya Therapy National Institute of the National Academy of Medical Sciences of Ukraine, Kharkiv, Ukraine;
26. GOES Research Group, Althaia Xarxa Assistencial Universitària de Manresa, Manresa, Spain;
27. Althaia Xarxa Assistencial Universitària de Manresa and Universitat de Vic-Universitat Central de Catalunya (UVicUCC), Manresa, Spain;
28. Complexo Hospitalario Universitario de Vigo (CHUVI) and Galicia Sur Health Research Institute (IIS Galicia Sur); SERGAS-UVIGO, Spain;
29. Unidad de Gastroenterología, Hospital Santos Reyes, Aranda de Duero, Spain;
30. Hospital Clínic de Barcelona, Centro de Investigación Biomédica en Red en Enfermedades Hepáticas y Digestivas (CIBERehd), IDIBAPS (Institut D'Investigacions Biomèdiques August Pi I Sunyer), University of Barcelona, Barcelona, Spain;
31. INSERM U1312, Université de Bordeaux, Bordeaux, France;
32. Trinity College Dublin, Dublin, Ireland;
33. Department of Microbiology, Donostia University Hospital-Biodonostia Health Research Institute, San Sebastian, Spain .