1. Department of Hepatobiliary, Pancreatic and Transplant Surgery, Department of Surgery, The Freeman Hospital, Tyne and Wear, Newcastle upon Tyne NE7 7DN, UK
2. Institute of Cellular Medicine, University of Newcastle, Newcastle upon Tyne, UK
3. College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
4. Department of Surgery and Cancer, HPB Surgical Unit, Imperial College, Hammersmith Hospital Campus, London, UK
5. Department of Surgery, Southampton University Hospital NHS Foundation Trust, Southampton, UK
6. Department of Hepatobiliary, Pancreatic and Transplant Surgery, Department of Surgery, The Freeman Hospital, Newcastle upon Tyne, UK