1. Department for 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 (UPMC) Italy, Palermo, Italy.
2. Department of Surgery and Surgical and Medical Specialties, University of Catania, Catania, Italy.