Footnotes

• Contributor CFF led the development of the item. Each of the co-authors contributed content and editorial input into the manuscript.

• Funding CFF was supported by an NHMRC Principal Research Fellowship (ID: 565900) and PMc was supported by an NHMRC Practitioner Fellowship. The Australian Centre for Research into Injury in Sport and its Prevention (ACRISP) is one of the International Research Centres for Prevention of Injury and Protection of Athlete Health supported by the International Olympic Committee (IOC). This work arose from research conducted through a Victorian Sports Injury Prevention Research Grant from the Department of Planning and Community Development, Victoria, Australia.

• Competing interests PMc currently receives financial research support from the National Health and Medical Research Council, the University of Melbourne, Victorian Department of Planning and Community Development, Sport and Recreation Division and the Eastern Health Network. Previous competitive grant funding includes the Australian Research Council, International Rugby Board, the University of Melbourne, the University of Otago (NZ), National Hockey League (US), VicHealth, Australian Football League Research Foundation, Royal Australasian College of Surgeons and the Australian Sports Commission. He has a clinical and consulting practice in neurology and sports medicine involving individuals who have sustained concussion and TBI. He has received travel funding from the Medical Commission of the International Olympic Committee (IOC), the International Football Federation (FIFA), the American Academy of Neurology and the Jockey Club (UK). He receives book royalties from McGraw-Hill and from 2001 to 2008 was employed by the British Medical Journal Publishing Group. He has conducted clinical drug trials on antimigraine (Glaxo-Welcome; Janssen-Cliag; Novartis; Parke-Davis; Schering) and antispasticity drugs (Ipsen) through the Eastern Health Clinical Trials Unit in Melbourne. This drug trial work has not involved any financial payment to PMc directly. He received consultancy fees from Axon Sports (USA) for the development of educational material (in 2010 which was not renewed) and has received support since 2001 from CogState Inc. for research costs and the development of educational material. He is a cofounder and shareholder in two biomedical companies involved in eHealth and sports compression garment technologies and does not hold any individual shares in any company related to concussion or brain injury assessment or technology.