1. National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
2. MRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
3. Department of Immunology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
4. Tshwane District Hospital, Pretoria, South Africa
5. Institute of Infectious Disease and Molecular Medicine, Division of Medical Virology, Department of Pathology, University of Cape Town, Cape Town, South Africa
6. Wellcome Centre for Infectious Diseases Research in Africa, University of Cape Town, Cape Town, South Africa
7. Division of Cardiology, Department of Medicine, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa
8. Cape Heart Institute, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
9. Division for Infectious Diseases, Department of Internal Medicine, Steve Biko Academic Hospital and University of Pretoria, Pretoria, South Africa
10. Centre for the AIDS Programme of Research in South Africa (CAPRISA), Durban, South Africa