[1] Univ Parma, Dept Med & Surg, Parma, Italy
[2] Santorso Hosp, ULSS7 Pedemontana, Dept Surg, Endoscop Unit, Santorso, Italy
[3] Cristo Re Hosp, GIOMI Grp, Div Internal Med & Gastroenterol, Rome, Italy
[4] ASL BAT, Gastroenterol Serv, Andria, BT, Italy