Funding for this research was provided by:
Department of Science and Technology, Republic of South Africa (DST/CON 0056/2014)
National Institute of Health (U54HG006938)
Received: 16 October 2020
Accepted: 13 January 2021
First Online: 10 February 2021
Ethics approval and consent to participate
: This study received ethical approval from the Human Research Ethics Committee (Medical) of the University of the Witwatersrand (Wits) (protocol number M121029) and was renewed in 2017 (protocol number M170880). Additional approvals were obtained from the local ethics review boards in research site prior to commencing any participant-related activities.
: Not applicable
: The authors declare that they have no competing interests.