1. Division of Gastroenterology and Hepatology, Johns Hopkins Medical Institution, Baltimore, Maryland, United States
2. Endoscopy Unit, Gastroenterology Department, ICMDiM, Hospital Clinic, University of Barcelona, Catalonia, Spain
3. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
4. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Barcelona, Spain
5. Gastroenterology Department, Hospital Universitario Rio Hortega, Valladolid, Spain
6. Digestive Endoscopy Unit, Division of Gastroenterology, Humanitas Clinical and Research Center – IRCCS, Rozzano, Italy
7. Department of Pathology, Humanitas Clinical and Research Center, Rozzano, Italy