Funding for this research was provided by:
United States Agency for International Development (72067419CA00004, AID-674-A-12-00029)
Received: 9 March 2020
Accepted: 16 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: The analysis of the anonymised retrospective data for this study was approved by the Human Research Ethics Committee (Medical) of the University of the Witwatersrand (M1704122 and M170579).
: Not applicable.
: The authors declare that they have no competing interests.