[1] Univ Milano Bicocca, IRCCS San Gerardo Tintori Monza, Dept Med & Surg, Div Gastroenterol, Monza, Italy
[2] Sapienza Univ Rome, Med Surg Sci & Translat Med, Rome, Italy
[3] Fdn IRCCS Ca Granda Osped Maggiore Policlin Milan, Gastroenterol & Endoscopy Unit, Milan, Italy
[4] Fdn IRCCS Ist Nazl Tumori, Gastroenterol & Digest Endoscopy Unit, Milan, Italy
[5] Univ Pavia, IRCCS Policlin San Matteo, Dept Internal Med, Pavia, Italy
[6] Univ Vita Salute San Raffaele, IRCCS San Raffaele Hosp, Gastroenterol & Endoscopy, Milan, Italy