1. Department of Obstetrics and Gynecology Nordland Hospital Bodø Norway
2. Division of Surgery, Oncology and Women's Health University Hospital of North Norway Tromsø Norway
3. Department of Obstetrics and Gynecology Oslo University Hospital Oslo Norway
4. Department of Obstetrics and Gynecology Sahlgrenska Academy Gothenburg University Gothenburg Sweden
5. Institute of Community Medicine UiT The Arctic University of Norway Tromsø Norway