Funding for this research was provided by:
National Health Laboratory Service
Received: 15 July 2020
Accepted: 31 January 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki. A waiver of individual informed consent was granted by Stellenbosch University’s Human Health Research Ethics Committee (HREC), reference S14/10/201.
: Not applicable.
: The authors declare that they have neither financial nor non-financial competing interests.