1. Division of Medical Virology Institute of Infectious Disease and Molecular Medicine (IDM) University of Cape Town Cape Town South Africa
2. Department of Epidemiology and Biostatistics City University of New York Graduate School of Public Health & Health Policy New York NY USA
3. Department of Statistics & Biostatistics Rutgers The State University Piscataway NJ USA
4. Division of Epidemiology & Biostatistics and Centre for Infectious Diseases Epidemiology & Research School of Public Health & Family Medicine University of Cape Town Cape Town South Africa
5. National Health Laboratory Services Cape Town South Africa
6. FHI 360DurhamNCUSA