1. Department of Surgery, University Hospital, Uppsala, Sweden
2. Department of Surgery, Malmö University Hospital, Malmö, Sweden
3. Department of Surgery, Karolinska University Hospital, Solna, Stockholm, Sweden
4. Department of Surgery, Sunderby Hospital, Luleå, Sweden
5. Department of Surgery, Helsingborgs Hospital, Helsingborg, Sweden
6. Department of Surgery, University Hospital, Linköping, Sweden
7. Department of Surgery, Sahlgrenska University Hospital/Östra, Gothenburg, Sweden
8. Department of Surgery, Regional Oncological Centre, University Hospital, Umeå, Sweden