1. Department of Gastroenterology and Alimentary Tract Surgery Tampere University Hospital Tampere Finland
2. Faculty of Social Sciences Tampere University Tampere Finland
3. Department of Surgery Vaasa Central Hospital Vaasa Finland
4. Department of Abdominal Surgery Helsinki University Hospital Finland
5. Department of Surgery Satakunta Central Hospital Pori Finland
6. Faculty of Medicine Helsinki University Helsinki Finland
7. Department of Surgery Päijät‐Häme Central Hospital Lahti Finland
8. Department of Surgery Central Hospital of Central Finland Jyväskylä Finland
9. Department of Surgery Seinäjoki Central Hospital Seinäjoki Finland
10. Department of Surgery North Karelia Central Hospital Joensuu Finland
11. Division of Digestive Surgery and Urology Turku University Hospital Turku Finland
12. Faculty of Medicine Turku University Turku Finland
13. Centre of Geriatrics Tampere University Hospital Tampere Finland
14. Faculty of Medicine and Health Technology Tampere University Tampere Finland
15. Gerontology Research Center (GEREC) Tampere Finland