1. Department of Physiology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
2. Sport, Exercise Medicine and Lifestyle Institute (SEMLI), Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
3. IOC Research Centre of South Africa, Pretoria, South Africa
4. Biostatistics Research Unit, South African Medical Research Council (SAMRC), Cape Town, South Africa
5. Division of Epidemiology and Biostatistics, Department of Global Health, Stellenbosch University, Cape Town, South Africa
6. Statistics and Population Studies Department, University of the Western Cape, Cape Town, South Africa