1. The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
2. Medical Research Council/Wits University Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
3. University of Wollongong, New South Wales, Australia
4. Wits Reproductive Health and HIV Institute, University of the Witwatersrand, Johannesburg, South Africa
5. University of Washington, Seattle, WA, USA
6. Johns Hopkins University School of Medicine, Baltimore, MD, USA
7. Science Facilitation Department, FHI 360, Durham, NC, USA