1 Department of Surgical, Oncological and Gastroenterological Sciences (DiSCOG), University of Padova, Second General Surgical Unit, Padova Teaching Hospital, Padua, Italy.
2 Hepatobiliary Surgery Unit, Fondazione Policlinico Universitario A. Gemelli, IRCCS, Catholic University of the Sacred Heart, Rome, Italy.
3 Gastroenterology Unit, Department of Internal Medicine, University of Genoa, Genoa, Italy.
4 Gastroenterology Unit, IRCCS Ospedale San Martino, Genoa, Italy.