1 Department of Medicine, Sykehuset Innlandet HF, Innlandet Hospital Trust, Anders Sandvigs gate 17, 2609 Lillehammer, Norway.
2 Section for Colorectal Cancer Screening, Cancer Registry of Norway, Colorectal Screen Norway, Postbox 5313 Majorstuen, 0304 Oslo, Norway.
3 University of Oslo, Clinical Effectiveness Research Group, Institute of Health and Society, Postbox 1130 Blindern, 0318 Oslo, Norway.
4 University of Oslo, Institute of Clinical Medicine, Postbox 1171 Blinders, 0318 Oslo, Norway.
5 Department of Paediatric and Adolescent Medicine, Sykehuset Innlandet HF, Innlandet Hospital Trust, Anders Sandvigs gate 17, 2609 Lillehammer, Norway.
6 Research Department, Sykehuset Innlandet HF, Innlandet Hospital Trust, Anders Sandvigs gate 17, 2609 Lillehammer, Norway.
7 University of Bergen, Centre for International Health, Postbox 7804, 5020 Bergen, Norway.