Funding for this research was provided by:
United States Agency for International Development (72067419CA00004, 674-A-12-00020, RNMC00-1344-AO12-DET550-5000, HSS-RPBC00-9100-TA30-DET500-3950, 674-A-0-09-00018-00)
Received: 29 April 2019
Accepted: 20 September 2019
First Online: 7 November 2019
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 (M140201).
: Not applicable.
: The authors declare that they have no competing interests.