1. Division of Epidemiology and Biostatistics, School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
2. Rakai Health Sciences Program, Uganda Virus Research Institute, Entebbe, Uganda
3. Julius Global Health, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands
4. Africa Centre for Health and Population Studies, University of KwaZulu-Natal, Somkhele, South Africa
5. Faculty of Medicine and Faculty of Social and Human Sciences, University of Southampton, Southampton, UK