[1] Univ Pavia, Dept Med 1, Pavia, Italy
[2] Univ Pavia, Endoscopy Unit, Fdn IRCCS Policlin S Matteo, Ctr Studio & Cura Malattia Celiaca, Pavia, Italy
[3] Fdn IRCCS Policlin S Matteo, Endoscopy Unit, Pavia, Italy
[4] IRCCS Ist Clin Humanitas, Div Gastroenterol, Milan, Italy