1. Turku University Hospital, Division of Digestive Surgery and Urology, University of Turku, Turku, Finland
2. Department of Surgery, University of Turku, Turku, Finland
3. Department of Surgery, Mikkeli Central Hospital, Mikkeli, Finland
4. Department of Surgery, Oulu University Hospital, Oulu, Finland
5. Division of Surgery, Gastroenterology and Oncology, Tampere University Hospital, Tampere, Finland
6. Department of Surgery, Jyväskylä Central Hospital, Jyväskylä, Finland
7. Department of Surgery, Kuopio University Hospital, Kuopio, Finland
8. Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland
9. Department of Surgery, Seinäjoki Central Hospital, Seinäjoki, Finland
10. Department of Biostatistics, University of Turku, Turku, Finland
11. Department of Sport and Health Sciences, Jyväskylä University, Jyväskylä, Finland
12. Department of Health and Medical Services, Päijät-Häme Joint Authority for Health and Wellbeing, Lahti, Finland
13. Department of Radiology, Oulu University Hospital, Oulu, Finland
14. Satakunta Central Hospital, Pori, Finland