1. Department of Surgery, University of Oulu, Oulu, Finland
2. Division of Operative Care, Oulu University Hospital and Medical Research Center Oulu, University of Oulu, Oulu, Finland
3. Divison of Surgery, Gastroenterology and Oncology, Tampere University Hospital, Tampere, Finland
4. Department of Surgery, Kuopio University Hospital, Kuopio, Finland
5. Division of Digestive Surgery and Urology, Turku University Hospital, Turku, Finland
6. Department of Surgery, University of Turku, Turku, Finland
7. Paulina Salminen Division of Digestive Surgery and Urology Turku University Hospital P.O. Box 52 Turku 20520 Finland
8. Department of Surgery University of Turku Turku Finland