1. Division of Gastroenterology, Fondazione IRCCS San Gerardo dei Tintori, University of Milano-Bicocca School of Medicine , Monza , Italy
2. Division of Coloproctology and IBD Surgery, IRCCS Ospedale San Raffaele, Vita-Salute San Raffaele University , Milan , Italy
3. Division of Gastroenterology and Endoscopy, IRCCS Ospedale San Raffaele, Vita-Salute San Raffaele University , Milan , Italy