1. Department of Surgery, Skåne University Hospital, Clinical Sciences, Lund University, Lund, Sweden
2. Regional Cancer Centre, Uppsala University Hospital, Uppsala, Sweden
3. Department of Oncology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
4. Department of Surgery, Clinical Sciences, Umeå University, Umeå, Sweden
5. Department of Surgery, St Göran's Hospital, Stockholm, Sweden
6. Department of Surgery, Clinical Sciences, Lund University, Lund, Sweden
7. Department of Surgery, Clinical Sciences, Linköping University, Linköping, Sweden