1. Hospital Universitario de La Princesa, [IIS-IP], UAM, and Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas [CIBERehd] , Madrid , Spain
2. Department of Surgery, University Hospital Brno, Faculty of Medicine, Masaryk University , Brno , Czech Republic
3. Hospital Universitario y Politécnico La Fe and CIBERehd , Valencia , Spain
4. Sheba Medical Center , Tel Hashomer , Israel
5. Bordeaux University Hospitals , Bordeaux , France
6. Shaare Zedek Medical Center and Faculty of Medicine, Hebrew University of Jerusalem , Israel
7. Linköping University Hospital and Department of Biomedical and Clinical Sciences , Linköping , Sweden
8. Hospital Clínico Universitario Lozano Blesa and CIBERehd , IIS Aragón, Zaragoza , Spain
9. Complejo Hospitalario Universitario de Santiago , Santiago de Compostela , Spain
10. Hospital Joan XXIII , Tarragona , Spain
11. University of Rome ‘Tor Vergata’ , Rome , Italy
12. IRabin Medical Center , Petach Tikva , Israel
13. Hvidovre University Hospital , Hvidovre , Denmark
14. Complexo Hospitalario Universitario de Pontevedra, Instituto de Investigación Sanitaria Galicia Sur , Pontevedra , Spain
15. Hospital Universitario Marqués de Valdecilla and IDIVAL , Santander , Spain
16. Careggi University Hospital , Florence , Italy
17. Mater Dei Hospital , Msida , Malta
18. Cleveland Clinic Foundation , Cleveland, OH , USA
19. Hospital de Cabueñes , Gijón , Spain
20. Hospital Universitario Virgen del Rocío , Sevilla , Spain
21. Hospital Universitario Infanta Sofía . San Sebastián de los Reyes , Spain
22. University Hospitals Leuven , Leuven , Belgium
23. University of Szeged, Albert Szent-Györgyi Medical School, Department of Internal Medicine , Szeged , Hungary
24. Hospital Universitario de Araba [sede Txagorritxu y sede Santiago] , Álava , Spain
25. Akershus Universitetssykehus , Lørenskog , Norway
26. Azienda Ospedaliera Pugliese-Ciaccio , Catanzaro , Italy
27. Gastroenterology Department, Dr. Balmis General University Hospital, Alicante Institute for Health and Biomedical Research (ISABIAL) , Alicante , Spain
28. Practice for Internal Medicine , Leipzig , Germany
29. Aarhus University Hospital , Aarhus , Denmark