1. Wits Diagnostic Innovation Hub, Faculty of Health Science, University of the Witwatersrand, Johannesburg 2093, South Africa
2. Department of Biostatistics, Boston University School of Public Health, Boston, MA 02118, USA
3. National Priority Program of the National Health Laboratory Services (NHLS), Johannesburg 2131, South Africa
4. Division of Infectious Diseases, Boston Medical Center, Boston, MA 02118, USA
5. Department of Epidemiology, University of North Carolina School, Chapel Hill, NC 27127, USA
6. Department of Geography and Environment, University of North Carolina, Chapel Hill, NC 27599, USA
7. National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2192, South Africa
8. Department of Clinical Research, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK
9. Faculty of Medicine and Health Sciences, University of Antwerp, 2000 Antwerpen, Belgium