1. Department of Surgery and Cancer, Hammersmith Hospital, Imperial College London, London W12 0TS, UK
2. Department of General Surgery, Memorial Healthcare System, Pembroke Pines, FL 33028, USA
3. Division of Digestive and Liver Diseases, UT Southwestern Medical Center, Dallas, TX 75390, USA
4. General Surgery and Oncologic Unit, Policlinico ponte San Pietro, 24036 Bergamo, Italy
5. Dipartimento DEA-EAS Ospedale Niguarda Ca’ Granda Milano, 20162 Milano, Italy
6. Department of Surgery, Calgiari University Hospital, 09121 Calgiari, Italy
7. 2nd Department of Propaedwutic Surgery, National and Kapodistrian University of Athens, 11527 Athens, Greece
8. Warwick Medical School, University of Warwick, Coventry CV4 7H, UK
9. The Transplantation Institute, Department of Surgery, University of Chicago, Chicago, IL 60637, USA