1. Department of Obstetrics and Gynaecology, The National Hospital, University of Oslo, N-0027 Oslo, Norway; University of Zimbabwe, Department of Obstetrics and Gynaecology, PO Box A-178, Avondale, Harare, Zimbabwe, and Institute of General Practice and Community Medicine, Department of International Health, University of Oslo, Postboks 1130, Blindern 0317, Olso, Norway
2. University of Zimbabwe, Department of Obstetrics and Gynaecology, PO Box A-178, Avondale, Harare, Zimbabwe
3. Department of Obstetrics and Gynaecology, The National Hospital, University of Oslo, N-0027 Oslo, Norway