Funding for this research was provided by:
Health Systems Research Initiative (MR/S013601/1)
Received: 24 August 2020
Accepted: 18 June 2021
First Online: 1 July 2021
: Research ethics clearance was obtained from Wits Research Ethics Committee (REC) (non-medical) (certificate H19/09/51) and the LSHTM REC (reference 17889–1) for this study.
: Not applicable.
: The authors declare that they have no competing interests.