1 Wits Reproductive Health and HIV Institute (WRHI), Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa. hrees@wrhi.ac.za.
2 Wits Reproductive Health and HIV Institute (WRHI), Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
3 Burnet Institute, Melbourne, Australia.
4 Department of Epidemiology and Preventive Medicine, Medicine, Nursing and Health Sciences, Monash University, Melbourne, Australia.
5 International Centre for Reproductive Health, Department of Urogynaecology, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium.