1 Wits Diagnostic Innovation Hub, Faculty of Health Science, University of the Witwatersrand, Johannesburg, South Africa.
2 Wits Diagnostic Innovation Hub, Faculty of Health Science, University of the Witwatersrand, Johannesburg, South Africa;, National Priority Program of the National Health Laboratory Service, Johannesburg, South Africa.
3 National Priority Program of the National Health Laboratory Service, Johannesburg, South Africa.
4 Department of Biostatistics, Boston University School of Public Health, Boston, MA 02118, USA.