1. Human Immunodeficiency Virus, Hepatitis, and Sexually Transmitted Infections Department, World Health Organization, Geneva, Switzerland
2. Centre for Infectious Disease Epidemiology and Research, School of Public Health and Family Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
3. Southern Africa Medical Unit, Médecins Sans Frontières, Cape Town, South Africa
4. Unitaid, Geneva, Switzerland