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, ZA
2 World Bank, World Bank Group, Washington, DC, US
3 National Health Laboratory Service (NHLS), Johannesburg, ZA
†deceased