1 Centre for Stroke and Brain Injury, School of Medicine and Public Health, University of Newcastle, Newcastle, Australia. andrew.gardner@newcastle.edu.au.
2 Hunter New England Local Health District Sports Concussion Program, Newcastle, NSW, Australia. andrew.gardner@newcastle.edu.au.
3 Priority Research Centre for Stroke and Brain Injury, Calvary Mater Hospital, Level 5, McAuley Building, Waratah, NSW, 2298, Australia. andrew.gardner@newcastle.edu.au.