1. Health Economics and HIV and AIDS Research Division (HEARD), University of KwaZulu-Natal, Durban, South Africa
2. Division of Social Medicine and Global Health, Lund University, Lund, Sweden
3. Epicentre AIDS Risk Management (Pty) Limited, South Africa
4. Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, South Africa
5. Department of Medical Microbiology, School of Laboratory Medicine and Medical Sciences, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa