1. Digestive Endoscopy, IRCCS Policlinico San Donato, San Donato Milanese, Italy
2. Gastroenterology Unit, IRCCS Policlinico San Donato, San Donato Milanese, Italy
3. Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milano, Italy
4. Internal Medicine Unit, IRCCS Policlinico San Donato, San Donato Milanese, Italy
5. Division of General Surgery, IRCCS Policlinico San Donato, San Donato Milanese, Italy
6. Department of Biomedical Sciences for Health, University of Milan, Milan, Italy