Funding for this research was provided by:
National Institute of Health (R01HD074560)
Received: 27 September 2019
Accepted: 17 November 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: Permission to conduct the study was obtained from the South African Medical Research Council’s Ethics Committee (EC018–10/2013) and the University of Connecticut Institutional Review Board (H12–340).
: Not applicable.
: The authors declare that they have no competing interests.