1. Department of the Treatment and Study of Abdominal Diseases and Abdominal Transplantation, Istituto di Ricovero e Cura a Carattere Scientifico-Istituto Mediterraneo per i Trapianti e Terapie ad Alta Specializzazione (IRCCS-ISMETT), University of Pittsburgh Medical Center Italy (UPMC Italy), Palermo, Italy
2. Department of Surgical, Oncological and Oral Sciences, University of Palermo, Palermo, Italy
3. Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy