1. Department of Medicine, Telemark Hospital, Skien, Norway
2. Department of Health Management and Health Economics, Institute of Health and Society, University of Oslo, Oslo, Norway
3. Cancer Registry of Norway, Oslo, Norway
4. Department of Transplantation Medicine and KG Jebsen Center for Colorectal Cancer Research, Oslo University Hospital, Oslo, Norway
5. Department of Medicine, Sørlandet Hospital Kristiansand, Kristiansand, Norway
6. Department of Epidemiology, Harvard TH Chan School of Public Health, Boston, MA, USA
7. Department of Medicine, Østfold Hospital, Kalnes, Norway
8. Department of Medicine, Vestre Viken Hospital, Bærum, Norway
9. Department of Medicine, Sørlandet Hospital Arendal, Arendal, Norway