1. Department of Public Health, School of Health Care Sciences, Sefako Makgatho Health Sciences University, Pretoria 0208, South Africa
2. College of Graduate Studies, University of South Africa, Pretoria 0003, South Africa
3. Non-Communicable Disease Research Unit, South African Medical Research Council, Cape Town 7505, South Africa
4. Research Administration and Development, University of Limpopo, Polokwane 0727, South Africa
5. Department of Life and Consumer Sciences, College of Agriculture and Environmental Sciences, University of South Africa, Johannesburg 1709, South Africa
6. Faculty of Health Sciences, University of Limpopo, Polokwane 0700, South Africa