[1] Valduce Hosp, Dept Gastroenterol, Como, Italy
[2] San Gerardo Hosp, Gastroenterol & Endoscopy Unit, Monza, Italy
[3] European Inst Oncol, Div Endoscopy, Milan, Italy
[4] Univ Brescia, Dept Surg, Spedali Civili, Brescia, Italy
[5] Citta Studi Clin Inst, Endoscopy Serv, Milan, Italy
[6] Rho Hosp, Dept Gastroenterol, AO Salvini, Rome, Italy
[7] Policlin Monza, Endoscopy Unit, Monza, Italy
[8] Garbagnate Hosp, Dept Gastroenterol, AO Salvini, Milan, Italy
[9] AO Circolo, Dept Internal Med, Busto Arsizio, Italy
[10] San Carlo Hosp, Dept Gastroenterol, Milan, Italy
[11] Humanitas Univ, Humanitas Res Hosp, Milan, Italy