1. Division of Digestive Surgery and Urology, Turku University Hospital, Turku, Finland
2. Department of Surgery, University of Turku, Turku, Finland
3. Abdominal Center, Department of Abdominal Surgery, Helsinki University Hospital, Helsinki, Finland
4. Department of Biostatistics, University of Turku, Turku, Finland
5. Department of Surgery, Seinäjoki Central Hospital, Seinäjoki, Finland
6. Department of Surgery, Vaasa Central Hospital, Vaasa, Finland
7. Department of Surgery, Hatanpää City Hospital, Tampere, Finland
8. Centre for Health and Social Economics, National Institute for Health and Welfare, Helsinki, Finland
9. Department of Public Health, University of Helsinki, Helsinki, Finland
10. Department of Endocrinology, Turku University Hospital, Turku, Finland
11. Turku PET Centre, University of Turku, Turku, Finland
12. Department of Surgery, Pori, Satakunta Central Hospital, Pori, Finland