1. Institute of Clinical Medicine; Oslo University Hospital; Oslo Norway
2. Department of Geriatric Medicine; Oslo University Hospital; Oslo Norway
3. Department of Gastrointestinal Surgery; Oslo University Hospital; Oslo Norway
4. K.G. Jebsen Colorectal Cancer Research Centre; Oslo University Hospital; Oslo Norway
5. Department of Digestive Surgery; Akershus University Hospital; Lørenskog Norway
6. The Cancer Unit; Innlandet Hospital Trust; Hamar Norway
7. Department of Public Health and Nursing; NTNU; Norway