1. Center for AIDS Prevention Studies, Department of Medicine, University of California San Francisco, USA
2. School of Public Health, Boston University, Boston, USA
3. Sonke Gender Justice, Cape Town, South Africa
4. Medical Research Council/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
5. Department of Family Medicine and Population Health, University of Antwerp, Antwerp, Belgium
6. Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, USA