1. Hepatobiliary Surgery Unit, First Department of Surgery, Azienda Ospedaliera della Provincia di Lodi, Lodi, Italy
2. Hepatobiliary Unit, University of Milan, Azienda Ospedaliera San Paolo, Milan, Italy
3. Istituto di Radiologia, Università degli Studi di Pavia, Policlinico San Matteo IRCCS, Pavia, Italy
4. Hepatobiliary–Pancreatic Surgery Division, Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan