1 Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
2 Department of Medical and Surgical Sciences, Sant'Orsola Malpighi Hospital, Bologna, Italy.
3 Gastroenterology Unit, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy.
4 Gastroenterology and Endoscopy Unit, San Bortolo Hospital, Vicenza, Italy.
5 Gastroenterology and Endoscopy Unit, San Giovanni Addolorata Hospital, Rome, Italy.
6 Gastroenterology Unit, Università Campus Bio-Medico, Rome, Italy.
7 Department of Medicine, Surgery and Dentistry, Scuola Medica Salernitana, University of Salerno, Salerno, Italy.
8 Geriatric Institute Pio Albergo Trivulzio, Milan, Italy.
9 Department of Clinical Medicine and Surgery, "Federico II" University of Naples, Naples, Italy.
10 Division of Gastroenterology, Department of Surgical, Oncological and Gastroenterological Sciences, University of Padua, Padua, Italy.
11 General Mini-Invasive and Bariatric Surgery Unit, "Luigi Vanvitelli" University of Campania, Naples, Italy.
12 Brotzu Hospital, Cagliari, Italy.
13 School of Specialization, Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, University of Milan, Milan, Italy.
14 Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, University of Milan, Milan, Italy.