[1] Maggiore Hosp, IRCCS, Div Nephrol, I-20122 Milan, Italy
[2] IRCCS, Gen Hosp, Div Gastroenterol, San Giovanni Rotondo, Italy
[3] Univ Padua, Div Gastroenterol, Padua, Italy
[4] AO San Giovanni Battista, Div Gastroenterol, Turin, Italy
[5] Osped Riuniti Bergamo, Div Gastroenterol, I-24100 Bergamo, Italy
[6] Univ Padua, Dept Pathol, I-35100 Padua, Italy
[7] Univ Genoa, Dept Internal Med, I-16126 Genoa, Italy