1. Division of Digestive Surgery and Urology, Departments of Acute and Digestive Surgery, Turku University Hospital, Turku, Finland2Department of Surgery, Turku University, Turku, Finland
2. Department of Surgery, Mikkeli Central Hospital, Mikkeli, Finland4Institute of Clinical Medicine, University of Eastern Finland, Joensuu, Finland
3. Department of Surgery, Oulu University Hospital, Oulu, Finland
4. Division of Surgery, Gastroenterology and Oncology, Tampere University Hospital, Tampere, Finland
5. Department of Surgery, Jyväskylä Central Hospital, Jyväskylä, Finland
6. Institute of Clinical Medicine, University of Eastern Finland, Joensuu, Finland8Department of Surgery, Kuopio University Hospital, Kuopio, Finland9Department of Surgery, Seinäjoki Central Hospital, Seinäjoki, Finland
7. Department of Public Health, University of Turku, Turku, Finland11Primary Health Care Unit, Hospital District of Southwest Finland, Turku, Finland
8. Department of Biostatistics, University of Turku, Turku, Finland
9. Department of Radiology, Turku University Hospital, Turku, Finland
10. Institute of Clinical Medicine, University of Eastern Finland, Joensuu, Finland7Department of Surgery, Jyväskylä Central Hospital, Jyväskylä, Finland
11. Department of Radiology, Oulu University Hospital, Oulu, Finland
12. Department of Radiology, Tampere University Hospital, Tampere, Finland