1. Department of Medical Research, Bærum Hospital, Vestre Viken Hospital Trust, PO Box 800, Drammen, Norway
2. Institute of Clinical Medicine, University of Oslo, PO Box 1171 Blindern, Oslo, Norway
3. Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, University of Oslo, PO Box 1122 Blindern, Oslo, Norway
4. Section of GI Endoscopy, Department of Transplantation Medicine, Division of Surgery, Inflammatory Medicine and Transplantation, Oslo University Hospital Rikshospitalet, PO Box 4950 Nydalen, Oslo, Norway
5. Department of Medicine, Bærum Hospital, Vestre Viken Hospital Trust, Drammen, Norway
6. Department of Bowel Cancer Screening, Cancer Registry of Norway, Majorstuen, Oslo, Norway