1. Section for Colorectal Cancer Screening Cancer Registry of Norway Oslo Norway
2. Center for Cancer Treatment Sørlandet Hospital Kristiansand Norway
3. Clinical Effectiveness Research Group, Institute for Health and Society University of Oslo Oslo Norway
4. Clinical Effectiveness Research Group, Institute of Clinical Medicine University of Oslo Oslo Norway
5. Department of Research Cancer Registry of Norway Oslo Norway
6. Department of Medicine Vestre Viken Hospital Trust Bærum Norway
7. Department of Medicine Østfold Hospital Moss Norway
8. Department of Medicine Sørlandet Hospital Kristiansand Norway