1. Southern Africa Labour and Development Research Unit (SALDRU), University of Cape Town, Rondebosch, South Africa
2. Health Economics and HIV and AIDS Research Division (HEARD), University of KwaZulu-Natal, Durban, South Africa
3. Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Durban, South Africa
4. Epicentre Health Research, Cape Town, South Africa
5. Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA