1 Hepatobiliary Unit, Department of Minimally Invasive General and Oncologic Surgery, Humanitas Gavazzeni University Hospital, Bergamo, Italy. luca.vigano@hunimed.eu.
2 Department of Biomedical Sciences, Humanitas University, Milan, Italy. luca.vigano@hunimed.eu.
3 Department of General Surgery and Transplantation, San Camillo Forlanini Hospital of Rome, Rome, Italy.