Funding for this research was provided by:
National Research Foundation (104987)
South African Medical Research Council
International Atomic Energy Agency
Received: 22 April 2020
Accepted: 1 September 2020
First Online: 21 September 2020
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of the Faculty of Health Sciences of the University of Cape Town and written informed consent to participate in the study was obtained from all subjects prior to participation in the study.
: Not applicable.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.