1. Department of Pathophysiology and Organ Transplantation, Humanitas Clinical and Research Center IRCCS, University of
Milan, Milan, Italy
2. Gastroenterology and Endoscopy Division, IRCCS Fondazione Ca' Granda Ospedale Maggiore Policlinico,
Milan, Italy
3. Outpatients Departmnent, Casa di Cura Villa Montallegro, Genoa, Italy