1. Department of Surgery SSORG – Scandinavian Surgical Outcomes Research Group Institute of Clinical Sciences Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Department of Surgery Region Västra Götaland Sahlgrenska University Hospital/Östra Gothenburg Sweden
3. Department of Surgery Centre for Surgical Science University Hospital of Zealand Køge Denmark
4. Department of Surgery Faculty of Medicine and Health Örebro University Örebro Sweden
5. Department of Surgery Blekinge Hospital Karlshamn Sweden
6. Department of Surgery Herlev Hospital University of Copenhagen Copenhagen Denmark
7. Department of Surgery Skaraborgs Hospital Skövde Skövde Sweden
8. Department of Surgery Karlstad Hospital Karlstad Sweden