Received: 14 April 2020
Accepted: 30 September 2020
First Online: 8 October 2020
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki and was approved by the University of Cape Town’s Human Research Ethics Committee (HREC Reference Number: 058/2018). Informed consent was obtained in writing from all participants.
: Not applicable.
: The authors declare that they have no competing interests.