1. Centre for Public Health Data, Institute of Health Informatics, University College London, London
2. Department of Clinical Research, London School of Hygiene & Tropical Medicine, London, UK, Africa Health Research Institute, School of Nursing and Public Health, University of KwaZulu-Natal, Somkhele
3. Department of Clinical Research, London School of Hygiene & Tropical Medicine, London, UK, Africa Health Research Institute, School of Nursing and Public Health, University of KwaZulu-Natal, Somkhele, School of Public Health, University of
the Witwatersrand, Johannesburg
4. Africa Health Research Institute, School of Nursing and Public Health, University of KwaZulu-Natal, Somkhele
5. Africa Health Research Institute, School of Nursing and Public Health, University of KwaZulu-Natal, Somkhele, School of Nursing and Public Health, University of KwaZulu-Natal, Durban, Centre for the AIDS Programme of Research in South Africa, University
of KwaZulu-Natal, Congella, South Africa