1. Department of Clinical Sciences, Division of Surgery, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden
2. Department of Medical Sciences, Uppsala University and Uppsala University Hospital, Uppsala, Sweden
3. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
4. Department of Pelvic Cancer, Division of Coloproctology, Karolinska University Hospital, Stockholm, Sweden
5. Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden