1. Department of Nursing Science, University of Zimbabwe College of Health Sciences, Box A178, Avondale, Harare, Zimbabwe
2. Department of Obstetrics and Gynecology, University of Zimbabwe College of Health Sciences, Box A178, Avondale, Harare, Zimbabwe
3. Institute of Clinical Medicine, Oslo University and Division of Women and Children, Oslo University Hospital, Rikshospitalet, 00 27 Oslo, Norway