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.