1. Gastroenterology and Digestive Endoscopy Unit, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy
2. Department of Pathophysiology and Organ Transplantation, University of Milan, Milan, Italy
3. Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
4. Digestive and Interventional Endoscopy Unit, Niguarda Hospital, ASST Niguarda, Milan, Italy
5. Postgraduate Specialization in Gastrointestinal Diseases, University of Milan, Milan, Italy
6. Gastroenterology and Endoscopy Unit, IRCCS Multimedica, Sesto San Giovanni, Milano
7. Department of Biomedical Sciences for Health, University of Milan, Milan, Italy