[1] Humanitas Univ, Rozzano, Italy
[2] IRCCS Ist Clin Humanitas, Rozzano, Italy
[3] Univ Palermo, Gastroenterol & Hepatol Unit, DiBiMIS, Palermo, Italy
[4] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Gastroenterol & Hepatol Unit, Milan, Italy
[5] ASST Nord Milano, Dept Med, Milan, Italy
[6] AO Santi Paolo & Carlo, Dept Internal Med, Milan, Italy
[7] Univ Genoa, Dept Surg & Integrated Diagnost, Genoa, Italy
[8] European Inst Oncol, Div Epidemiol & Biostat, Milan, Italy