3 Psychology, University of Missouri, Kansas City, Missouri, USA.
4 Psychological and Neurobehavioral Associates, Inc, Kansas City, Missouri, USA.
5 Physiotherapy Department, University Hospitals Dorset NHS Foundation Trust, Poole, UK.
6 The FA Centre for Para Football Research, The Football Association, Burton-Upon-Trent, UK.
7 School of Sport, Health and Exercise Science, University of Portsmouth, Portsmouth, UK.
8 Psychology, University of Melbourne, Parkville, Victoria, Australia.
9 Brain and Mind, Murdoch Children's Research Institute, Parkville, Victoria, Australia.
10 Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts, USA.
11 Neurosurgery/Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
12 Michigan Concussion Center, University of Michigan, Ann Arbor, Michigan, USA.
13 Biomedical and Health Informatics, University of Missouri, Kansas City, Missouri, USA.
14 Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.
15 Children's National Health System, Washington, District of Columbia, USA.
16 School of Medicine, George Washington University, Washington, DC, USA.
17 Neurosurgery, UCLA Steve Tisch BrainSPORT Program, Los Angeles, California, USA.
18 Pediatrics/Pediatric Neurology, Mattel Children's Hospital UCLA, Los Angeles, California, USA.
19 Sports Medicine Research Laboratory, University of North Carolina, Chapel Hill, North Carolina, USA.
20 Family Medicine, University of Washington, Seattle, Washington, USA.
21 Departments of Rehabilitation Medicine, Orthopaedics and Sports Medicine and Neurological Surgery, University of Washington, Seattle, Washington, USA.
22 Florey Institute of Neuroscience and Mental Health - Austin Campus, Heidelberg, Victoria, Australia.
23 La Trobe Sport and Exercise Medicine Research Centre, Melbourne, Victoria, Australia.
24 University of Pennsylvania, Philadelphia, Pennsylvania, USA.
25 Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.
26 Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
27 Department of Athletic Training and School of Osteopathic Medicine, A.T. Still University, Mesa, Arizona, USA.
28 Sports Medicine, Children's Hospital Boston, Boston, Massachusetts, USA.
29 Emergency Medicine, Children's Hospital Boston, Boston, Massachusetts, USA.
30 Medicine, University of Alberta, Edmonton, Alberta, Canada.
31 Wits Sport and Health (WiSH), School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg-Braamfontein, South Africa.