1 Murdoch Children's Research Institute, Parkville, Victoria, Australia gavin.davis@me.com.
2 Cabrini Health, Malvern, Victoria, Australia.
3 Wits Sport and Health (WiSH), School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg-Braamfontein, South Africa.
4 Department of Pediatrics, McMaster University, Hamilton, Ontario, Canada.
5 Child Neuropsychology, Murdoch Childrens Research Institute, Parkville, Victoria, Australia.
6 Psychology, University of Melbourne, Parkville, Victoria, Australia.
7 Children's National Health System, Washington, District of Columbia, USA.
8 Neurosurgery, UCLA Steve Tisch BrainSPORT Program, Los Angeles, California, USA.
9 Pediatrics / Pediatric Neurology, Mattel Children's Hospital UCLA, Los Angeles, California, USA.
10 Psychology, University of Calgary, Calgary, Alberta, Canada.
11 Physiotherapy Department, University Hospitals Dorset NHS Foundation Trust, Poole, UK.
12 The FA Centre for Para Football Research, The Football Association, Burton-Upon-Trent, UK.
13 Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation/Harvard Medical School, Boston, Massachusetts, USA.
14 The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.
15 Orthopedics and Sports Medicine, Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.
16 Department of Radiology, University of Calgary, Calgary, Alberta, Canada.
17 Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontatio, Canada.
18 Psychology, University of Missouri Kansas City, Kansas City, Missouri, USA.
19 Psychological and Neurobehavioral Associates, Inc, Miami, Florida, USA.
20 Rehabilitation, Laval University, Quebec, Quebec, Canada.
21 School of Health and Related Research, University of Sheffield, Sheffield, UK.
22 Family Medicine, University of Washington, Seattle, Washington, USA.
23 Departments of Rehabilitation Medicine, Orthopaedics and Sports Medicine and Neurological Surgery, University of Washington, Seattle, Washington, USA.
24 University of Calgary, Calgary, Alberta, Canada.
25 Institute for Sport Exercise and Health, University Collage Hospital London, London, UK.
26 Florey Institute of Neuroscience and Mental Health - Austin Campus, Heidelberg, Victoria, Australia.
27 La Trobe Sport and Exercise Medicine Research Centre, Melbourne, Victoria, Australia.
28 Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
29 Sports Medicine, Children's Hospital Boston, Boston, Massachusetts, USA.
30 Emergency Medicine, Children's Hospital Boston, Boston, Massachusetts, USA.
31 Musculoskeletal Medicine, Royal Orthopaedic Hospital, Birmingham, UK.
32 Libraries, University of Victoria, Victoria, British Columbia, Canada.
33 Major League Soccer, New York, New York, USA.
34 Sport Injury Prevention Research Centre, University of Calgary, Calgary, Alberta, Canada.
35 International Concussion and Head Injury Research Foundation, London, UK.
36 University of Calgary Faculty of Kinesiology, Calgary, Alberta, Canada.
37 Loughborough University, Loughborough, UK.
38 Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.