1. Department of Surgery Gødstrup Hospital Herning Denmark
2. Department of Surgery Aarhus University Aarhus Denmark
3. St Mark's Hospital, Northwick Park Harrow UK
4. Department of Surgery Aarhus University Hospital Aarhus Denmark
5. Department of Clinical Medicine, Danish Center for Clinical Health Services Research Aalborg University Aalborg Denmark
6. Colorectal Surgery Unit Hospital Universitario Marques de Valdecilla and Valdecilla Biomedical Research Institute, IDIVAL Santander Spain
7. Klinik fur Allgemein‐und Viszeralchirurgie Kliniken Boblingen Germany
8. Haraldsplass Diakonale Sykehus Bergen Norway
9. Norfolk & Norwich University Hospital Norwich UK
10. Queen's Medical Centre Nottingham University Hospitals Nottingham UK