1. Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
2. Department of Surgery, Ersta Hospital, Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden
3. Department of Surgery, Södertälje Hospital, Södertälje, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
4. Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
5. Department of Pelvic Cancer, Gastrointestinal Oncology and Colorectal Surgery Unit, Karolinska University Hospital, Stockholm, Sweden
6. Clinical Epidemiology Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden