1. Department of Obstetrics and Gynaecology; Chris Hani Baragwanath Academic Hospital and University of the Witwatersrand; Johannesburg South Africa
2. Centre for Health Policy; MRC Health Policy Research Group; School of Public Health; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
3. Wits Reproductive Health and HIV Institute; University of the Witwatersrand; Johannesburg South Africa
4. Anova Health Institute; Johannesburg South Africa
5. School of Public Health and Family Medicine; University of Cape Town; Cape Town South Africa