1 Department of Research and Development, Telemark Hospital, Skien, Norway; Department of Colorectal Cancer Screening, Cancer Registry of Norway, Oslo, Norway; Institute of Health and Society, University of Oslo, Oslo, Norway.
2 Department of Colorectal Cancer Screening, Cancer Registry of Norway, Oslo, Norway.
3 Department of Colorectal Cancer Screening, Cancer Registry of Norway, Oslo, Norway; Institute of Health and Society, University of Oslo, Oslo, Norway; Department of Medicine, Sorlandet Hospital Kristiansand, Kristiansand, Norway.