1. School of Human Sciences (Exercise and Sports Science); University of Western Australia; Perth WA 6009 Australia
2. Aspetar Sports Medicine Hospital, PO Box 29222; Doha Qatar
3. Statistical Consulting Centre, School of Mathematics and Statistics; University of Melbourne; Vic 3010 Australia
4. Australian Institute of Sport; Canberra 2617 Australia
5. Mary Mackillop Institute for Health Research, Australian Catholic University; Melbourne Australia
6. Western Australian Institute of Sport, Mt Claremont; WA 6010 Australia