Received: 17 July 2020
Accepted: 9 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: This study has been performed in accordance with the Declaration of Helsinki. Approval to conduct the study was obtained from the University of the Witwatersrand Human Research Ethics Committee (Protocol number - M180701).
: Not applicable.
: The authors declare that they have no competing interests.