1. CIBER de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain
2. Instituto de Investigación Sanitaria Aragón (IIS Aragón), Zaragoza, Spain
3. Department of Gastroenterology, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
4. Faculty of Medicine, Universidad de Zaragoza, Zaragoza, Spain
5. Department of Gastroenterology, Hospital Donostia/Instituto Biodonostia, Universidad del País Vasco (UPV/EHU), San Sebastián, Spain
6. Instituto Aragonés de Ciencias de la Salud (IACS), Zaragoza, Spain
7. Department of Gastroenterology, Hospital Universitario de Canarias, Instituto Universitario de Tecnologías Biomédicas (ITB), Centro de Investigación Biomédica de Canarias (CIBICAN), Tenerife, Spain
8. Department of Gastroenterology, Hospital San Jorge, Huesca, Spain
9. Faculty of Medicine and Department of Microbiology, Hospital Clínico Universitario, Zaragoza, Spain
10. Department of Gastroenterology, Hospital Obispo Polanco, Teruel, Spain
11. Department of Gastroenterology, Hospital del Sol, Marbella, Spain
12. Department of Gastroenterology, Complejo Hospitalario, León, Spain
13. Department of Gastroenterology, Hospital Parc Tauli, Sabadell, Spain
14. Department of Gastroenterology, Hospital 12 de Octubre, Madrid, Spain
15. Department of Gastroenterology, Hospital Clínico Universitario, Salamanca, Spain
16. Department of Gastroenterology, Hospital Clinic I Provincial, Institut d Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universidad de Barcelona, Barcelona, Spain
17. Department of Gastroenterology, Hospital de Cruces, Barakaldo, Spain
18. Department of Gastroenterology, Hospital Josep Trueta, Girona, Spain
19. Department of Gastroenterology, Mutua de Tarrasa, Spain
20. Department of Gastroenterology, Hospital de Mataró, Mataró, Spain
21. Department of Gastroenterology, Hospital del Mar, Barcelona, Spain
22. BioDonostia Health Research Institute, IKERBASQUE, Basque Foundation for Science, San Sebastián, Spain