1. Faculty of Health Sciences, Sport, Exercise Medicine, Lifestyle Institute (SEMLI), University of Pretoria, Pretoria, South Africa
2. Department of Physiology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
3. Research Institute for Sport and Exercise, University of Canberra, Canberra, Australia
4. Institute of Sport, Exercise and Health (ISEH), University College London, London, UK
5. Department of Respiratory Medicine, Royal Brompton Hospital, London, UK
6. International Olympic Committee (IOC) Research Centre of South Africa, Pretoria, South Africa