1 Wits Sport and Health (WiSH), School of Clinical Medicine, University of the Witwatersrand Faculty of Health Sciences, Johannesburg, Gauteng, South Africa jpat@mweb.co.za.
2 Centre for Sport and Exercise Science and Medicine, University of Brighton, Brighton, East Sussex, UK.
3 School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, Leicestershire, UK.