1. Desmond Tutu HIV Centre, Institute of Infectious Diseases & Molecular Medicine, University of Cape Town, Cape Town, South Africa
2. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
3. Paediatric AIDS Treatment for Africa, Cape Town, South Africa
4. Department of Psychology, University of Cape Town, Cape Town, South Africa
5. School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa