1. Radboud University Medical Center Nijmegen; Department of Surgery; PO Box 9101 internal code 618 Nijmegen Netherlands 6500 HB
2. Radboud University Medical Center Nijmegen; Department of Gastroenterology and Hepatology; P.O. Box 9101, code 455 Nijmegen Netherlands
3. Royal Free Hospital; Department of HPB & Transplant Surgery; London UK
4. Royal Free Campus, UCL Medical School; Department of Surgery; Royal Free Hospital Rowland Hill Street London UK NW3 2PF