1 Sport, Exercise Medicine and Lifestyle Institute (SEMLI) and Section Sports Medicine, Faculty of Health Sciences, Section Sports Medicine, University of Pretoria Sports Campus, Burnett Street, Hatfield, Pretoria, 0020, South Africa.
2 IOC Research Centre, South Africa.
3 Department of Veterans Affairs, Northern California Health Care System, Sacramento, California, USA.
4 Department of Physical Medicine and Rehabilitation, University of California Davis Medical Center, Sacramento, California, USA.