1. General Surgery Unit, Vizzolo Predabissi Hospital, ASST Milano-Martesana, Vizzolo Predabissi (MI), Italy.
2. Day/Week Surgery Unit, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
3. Department of Pathophysiology and Transplantation, University of Milano, Milan, Italy.