1. Department of Exercise Science and Sports Medicine, School of Therapeutic Sciences, Faculty of Health Sciences, University of Witwatersrand, Johannesburg 2193, South Africa
2. Department of Exercise Science, Faculty of Science, University of Auckland, Auckland 1023, New Zealand
3. Department of Family Medicine and Primary Care, Faculty of Health Sciences, University of Witwatersrand, Johannesburg 2193, South Africa
4. Section Sports Medicine, Faculty of Health Sciences, University of Pretoria, Pretoria 0028, South Africa
5. UCT Research Centre for Health through Physical Activity, Lifestyle and Sport (HPALS), Department of Human Biology, Division of Research Unit for Exercise Science and Sports Medicine, Division of Physiological Sciences, Faculty of Health Sciences, University of Cape Town, Cape Town, 7700, South Africa
6. College of Public Health, Temple University, Philadelphia, PA 19122, USA