[1] Gemelli Isola Hosp, Osped Isola Tiberina, Digest Endoscopy Unit, Via Ponte Quattro Capi 39, I-00186 Rome, Italy
[2] Mater Olbia Hosp, Gastroenterol & Digest Endoscopy, Olbia, Italy
[3] Univ Belgrade, Fac Med, Belgrade, Serbia
[4] Univ Clin Ctr Serbia, Clin Gastroenterohepatol, Belgrade, Serbia
[5] Gemelli Isola Hosp, Osped Isola Tiberina, Digest & Colorectal Surg Unit, Rome, Italy
[6] Univ Cattolica Sacro Cuore, Fdn Policlin Univ A Gemelli IRCCS, Div Endocrine & Metab Surg, Rome, Italy