Published on in Vol 7, No 4 (2019): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12652, first published
.
1 Wits Reproductive Health and HIV Institute, University of Witwatersrand, Johannesburg, South Africa
2 World Bank, World Bank Group, Washington, DC, United States
3 National Health Laboratory Service (NHLS), Johannesburg, South Africa
†deceased