1. Department of Epidemiology, University of North Carolina, Chapel Hill, USA
2. MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, South Africa
3. Women’s Global Health Imperative, RTI International, Berkeley, USA
4. Department of Epidemiology, Robert N Butler Columbia Aging Center, Mailman School of Public Health, Columbia University, New York, USA
5. Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
6. Department of Epidemiology and Global Health, Umeå University, Umeå, Sweden