1. Health Economics and Epidemiology Research Office Department of Internal Medicine School of Clinical Medicine Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
2. Center for Global Health & Development Boston University Boston MA USA
3. Right to Care Johannesburg South Africa
4. Clinical HIV Research Unit Department of Internal Medicine School of Clinical Medicine Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
5. Department of Epidemiology Boston University School of Public Health Boston MA USA