1. Department of Biomedical Sciences, Faculty of Health and Wellness Science, Cape Peninsula University of Technology, Cape Town, South Africa
2. Non-Communicable Diseases Research Unit, South African Medical Research Council, Cape Town, South Africa
3. Department of Medicine, University of Cape Town, Cape Town, South Africa
4. Department of Human Biology, Faculty of Health Sciences, Walter Sisulu University, Mthatha, South Africa
5. Department of Pathology, Faculty of Health Sciences, National Health Laboratory Service (NHLS) and University of Stellenbosch, Cape Town, South Africa