1. Division of Social and Behavioural Sciences, School of Public Health, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa;
2. Centre for Social Science Research, University of Cape Town, Cape Town, South Africa;
3. Department of Social Policy and Intervention, University of Oxford, Oxford, United Kingdom;
4. Department of Child and Adolescent Psychiatry, University of Cape Town, Cape Town, South Africa;
5. School of Public Health, University of the Western Cape, Bellville, South Africa;
6. MRC Centre for Global Infectious Disease Analysis, School of Public Health, Imperial College London, London, United Kingdom;
7. Centre for HIV and STIs, National Institute of Communicable Diseases, a Division of the National Health Laboratory Service, Johannesburg, South Africa;
8. Department of Paediatrics and Child Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; and
9. Department of Sociology, University of Cape Town, Cape Town, South Africa.