1 Wits Sport and Health (WiSH), School of Clinical Medicine, Faculty of Health Sciences University of the Witwatersrand, Johannesburg, South Africa jpat@mweb.co.za.
2 High Performance Comission, Medical Advisory Committee, South African Sports Confederation and Olympic Committee, Salt Rock, KwaZulu/Natal, South Africa.
3 Research and Innovation, University of Toronto, Toronto, Ontario, Canada.
4 Center for Sports Cardiology, University of Washington, Seattle, Washington, USA.