1. Section for International Health, Department of General Practice and Community Medicine, Institute of Health and Society, University of Oslo, Blindern, 0317 Oslo, Norway
2. Oslo University Hospital, Department of Obstetrics and Gynaecology, National Resource Centre for Women’s Health, N-0027 Oslo, Norway
3. Section for International Health, Department of General Practice and Community Medicine, Institute of Health and Society, University of Oslo, P.O. BOX 1130 Blindern, N-0318 Oslo, Norway