1. Digestive Disease Section, Hospital Universitario de Móstoles, Móstoles, Spain
2. Gastroenterology Department, Hospital Clínic de Barcelona, Barcelona, Spain
3. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Barcelona, Spain
4. Gastroenterology Department, Hospital Universitario de Bellvitge, Hospitalet de Llobregat, Spain
5. Gastroenterology Department, Hospital Universitari Mútua de Terrassa, Terrassa, Spain
6. Gastroenterology Department, Instituto Biodonostia, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Universidad del País Vasco (UPV/EHU), San Sebastián, Spain
7. Gastroenterology Department, Hospital del Mar, Barcelona, IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain
8. Gastroenterology Department, Hospital Clínico San Carlos, Madrid, Spain
9. Gastroenterology Department, Complexo Hospitalario Universitario de Ourense, Ourense, Spain
10. Gastroenterology Department, Hospital Puerta de Hierro, Majadahonda, Spain
11. Gastroenterology Department, Hospital Universitario del Sureste, Arganda del Rey, Spain
12. Gastroenterology Department, Complejo Hospitalario de Navarra, Pamplona, Spain
13. Gastroenterology Department, Hospital de Sagunto, Sagunto, Spain
14. Gastroenterology Department, Hospital Universitario de Canarias, La Laguna, Spain
15. Gastroenterology Department, Hospital Universitario Morales Meseguer, Murcia, Spain
16. Gastroenterology Department, Hospital Josep Trueta, Girona, Spain
17. Gastroenterology Department, Hospital de Galdakao Usansolo, Galdakao, Spain
18. Gastroenterology Department, Hospital General de Alicante, Alicante, Spain
19. Gastroenterology Department, Complexo Hospitalario Universitario de Vigo, Vigo, Spain
20. Gastroenterology Department, Hospital General de Catalunya, Sant Cugat del Vallès, Spain
21. Gastroenterology Department, Hospital Universitario 12 de Octubre, Madrid, Spain
22. Pathology Department, Hospital Clínic de Barcelona, Barcelona, Spain