1. Southern Africa Labour and Development Research Unit (SALDRU), University of Cape Town, Cape Town, South Africa.
2. The Desmond Tutu HIV Centre, University of Cape Town, Cape Town, South Africa.
3. Department of Behavioral and Social Sciences, Brown University School of Public Health, Providence, Rhode Island.
4. Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa.
5. Department of Epidemiology, Brown University School of Public Health, Providence, Rhode Island.
6. Department of Health Services, Policy and Practice (HSPP), Brown University School of Public Health, Providence, Rhode Island.