Funding for this research was provided by:
United States Agency for International Development (AID-674-A-12-00029)
Received: 30 July 2018
Accepted: 3 December 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: Approval for data collection was obtained from the Human Research Ethics Committee (Medical) of the University of the Witwatersrand for protocol number M140212. Permission to perform the research was also obtained from the City of Johannesburg and the study clinics. All participants provided written informed consent.
: Not applicable.
: The authors declare no competing interests.