1. Division of Transplantation and Hepatobiliary Surgery, Department of Surgery, University of Rochester Medical Center, Rochester, NY
2. Institute of Clinical Medicine, University of Oslo, Oslo, Norway
3. Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway
4. Experimental Transplantation and Malignancy Research Group, Division of Surgery, Inflammatory Diseases and Transplantation, Oslo University Hospital, Oslo, Norway