1. Maternal, Adolescent and Child Health and Reproductive Health and HIV Research Unit, Department of Obstetrics & Gynaecology, University of The Witwatersrand, Durban
2. Program for Appropriate Technology in Health, Johannesburg, South Africa
3. Institute of Tropical and Preventive Medicine, University of Bern, Bern, Switzerland
4. Centre for Health Policy, School of Public Health, University of Witwatersrand, Durban, South Africa
5. Department of Obstetrics and Gynaecology, Ghent University, Belgium