1 Psychology, University of Missouri Kansas City, Kansas City, Missouri, USA rechemendia@comcast.net.
2 Psychological and Neurobehavioral Associates, Inc, Port Matilda, Pennsylvania, USA.
3 Physiotherapy Department, University Hospitals Dorset NHS Foundation Trust, Poole, UK.
4 The FA Centre for Para Football Research, The Football Association, Burton-Upon-Trent, UK.
5 University Hospitals, Cleveland, Ohio, USA.
6 Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.
7 Biomedical and Health Informatics, University of Missouri - Kansas City, Kansas City, Missouri, USA.
8 Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.
9 Murdoch Children's Research Institute, Parkville, Victoria, Australia.
10 Cabrini Health, Malvern, Victoria, Australia.
11 Children's National Health System, Washington, District of Columbia, USA.
12 Orthopedics, Sports Medicine Center, Children's Hospital Colorado, Orthopedics, University of Colorado School of Medicine, Aurora, Colorado, USA.
13 School of Health and Related Research, University of Sheffield, Sheffield, UK.
14 Departments of Pediatrics and Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.
15 Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.
16 Departments of Internal Medicine and Neurology, University of Arizona College of Medicine, Phoenix, Arizona, USA.
17 Banner - University Medical Center Phoenix, Phoenix, Arizona, USA.
18 Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.
19 Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
20 Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
21 Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University School of Medicine, Richmond, Virginia, USA.
22 Pediatrics, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada.
23 Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada.
24 Wits Sport and Health (WiSH), School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg-Braamfontein, South Africa.