[1] IRCCS San Raffaele Sci Inst, Coloproctol & Inflammatory Bowel Dis Surg Unit, Via Olgettina 60, I-20132 Milan, Italy
[2] Hosp San Paolo, UOC Gen & Minimally Invas Surg, Largo Donatori Sangue 1, I-00053 Rome, Civitavecchia, Italy
[3] Mansoura Univ Hosp, Dept Gen Surg, Colorectal Surg Unit, Mansoura, Egypt
[4] Sapienza Univ Rome, Dept Surg, Rome, Italy
[5] San Benedetto Tronto Gen Hosp, ASUR Marche 5, San Benedetto Tronto, Italy
[6] IRCCS San Raffaele Sci Inst, Gastrointestinal Surg, Via Olgettina 60, Milan, Italy
[7] Biella Hosp, Gen Surg, SS Colo Rectal & Proctol Surg, Ponderano, Biella, Italy
[8] Univ Vita Salute San Raffaele, IRCCS San Raffaele Sci Inst, Coloproctol & Inflammatory Bowel Dis Surg Unit, Via Olgettina 60, I-20132 Milan, Italy