1. Wits School of Clinical Medicine, University of the Witwatersrand, Johannesburg, South Africa
2. Wits Reproductive Health and HIV Institute, University of the Witwatersrand, Johannesburg, South Africa
3. Wits School of Public Health, University of the Witwatersrand, Johannesburg, South Africa
4. Centre for Evidence-Based Intervention, Department of Social Policy and Intervention, University of Oxford, Oxford, United Kingdom
5. Psychosocial Analytics, Halfway House, South Africa
6. Department of Population, Reproductive and Family Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, USA