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