1 Department of Medicine, Sørlandet Hospital, Kristiansand, Norway; Department of Health Management and Health Economics, University of Oslo, Oslo, Norway.
2 Department of Medicine, Sørlandet Hospital, Kristiansand, Norway; Department of Health Management and Health Economics, University of Oslo, Oslo, Norway; Department of Transplantation Medicine and KG Jebsen Center for Coilorectakl Cancer Research, Oslo University Hospital, Oslo, Norway.