1. Colorectal Research Unit, Colorectal Surgical Department P, Aarhus University Hospital Tage-Hansens Gade 2 DK-8000, Aarhus C, Denmark
2. Surgical Department, Hilleroed Hospital, Hilleroed, Denmark
3. Faculty of Health, Copenhagen University, Copenhagen, Denmark
4. Department of Surgery, Roskilde Hospital, Roskilde, Denmark
5. Department of Surgery, Herning Regional Hospital, Herning, Denmark
6. Surgical Section, The Gastro-unit, Hvidovre Hospital, Hvidovre, Denmark
7. Department of Surgery A, Aalborg University Hospital, Aalborg, Denmark
8. Surgical Department A, Odense University Hospital Svendborg, Svendborg, Denmark
9. Department of Surgery K, Regional Hospital Randers, Randers, Denmark