Funding for this research was provided by:
National Health Laboratory Service (GRANT004 94626)
Received: 15 December 2020
Accepted: 29 July 2021
First Online: 18 August 2021
: Ethics approval was obtained from the Research Ethics committee, Faculty of Health Sciences, University of Pretoria (REC no: 237/2017). Written informed consent was received from all participants. All methods were performed in accordance with the guidelines and regulations as stipulated by the REC.
: Not applicable.
: The authors declare that they have no competing interest.