1. HUS Diagnostic Center, Radiology, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland
2. Department of Radiology, Turku University Hospital and University of Turku, 20521 Turku, Finland
3. HUS Abdominal Center, Endoscopy Department, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland
4. Department of Clinical Sciences Malmö, Lund University, 22100 Malmö, Sweden
5. Department of Surgery and Gastroenterology, Skåne University Hospital, 20502 Malmö, Sweden
6. Department of Gastrointestinal Surgery, Oulu University Hospital, 90220 Oulu, Finland
7. Department of Radiology, Oulu University Hospital, 90220 Oulu, Finland
8. Division of Digestive Surgery and Urology, Turku University Hospital and University of Turku, 20521 Turku, Finland