G Clerico1, G Gallo1,2, A Realis Luc1, M Trompetto3. 1. Department of Colorectal Surgery, S. Rita Clinic, Viale Dell'Aereonautica14/16, 13100, Vercelli, Italy. 2. Department of Surgical and Medical Sciences, "Magna Graecia" University of Catanzaro, Catanzaro, Italy. 3. Department of Colorectal Surgery, S. Rita Clinic, Viale Dell'Aereonautica14/16, 13100, Vercelli, Italy. trompetto.mario@libero.it.