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