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