1 Charles Perkins Centre, Epidemiology Unit, University of Sydney, Sydney, New South Wales, Australia.
2 Prevention Research Collaboration, School of Public Health, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia.
3 School of Sport Exercise and Health Sciences, Loughborough University, Loughborough, UK.
4 Sport and Exercise Sciences Research Institute, University of Ulster, Northern Ireland, UK.