Salvatore Gruttadauria1,2. 1. Department for the Treatment and Study of Abdominal Diseases and Abdominal Transplantation, IRCCS ISMETT (Istituto di Ricovero e Cura a Carattere Scientifico-Istituto Mediterraneo per i Trapianti e Terapie ad alta specializzazione), UPMC (University of Pittsburgh Medical Center), Palermo, Italy. 2. Department of Surgery and Surgical Medical Specialties, University of Catania, Catania, Italy.