1. HIV Department, World Health Organization, Geneva, Switzerland
2. Wellcome Trust Centre for Infectious Diseases Research in Africa, Institute of Infectious Disease and Molecular Medicine
3. Department of Medicine, Faculty of Health Sciences, University of Cape Town, South Africa
4. Division of Infectious Diseases, HIV Unit, Department of Internal Medicine Specialties, Geneva University Hospitals and Faculty of Medicine, Switzerland
5. Médecins Sans Frontières, Southern Africa Medical Unit, Cape Town, South Africa