1. Department of Gastrointestinal Surgery, Stavanger University Hospital , Stavanger , Norway
2. Department of Clinical Medicine, University of Bergen , Bergen , Norway
3. Division of Surgery and Oncology, Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Karolinska University Hospital , Stockholm , Sweden
4. College of Medicine and Public Health, Flinders University , Adelaide, South Australia , Australia
5. HPB and Liver Transplant Unit, Flinders Medical Centre , Adelaide, South Australia , Australia
6. Hepatopancreatobiliary and Transplant Unit, Freeman Hospital , Newcastle upon Tyne , UK