1. Harborview Injury Prevention and Research Center, University of Washington, Seattle
2. Harborview Injury Prevention and Research Center and School of Social Work, University of Washington, Seattle
3. University of Oklahoma, Norman
4. NorthShore University Health System, Evanston, IL
5. The Orthopaedic Center, A Division of CAO, Rockville, MD
6. University of Michigan Athletic Medicine, Ann Arbor
7. University of South Carolina School of Medicine, Greenville
8. University of Pittsburgh Medical Center, PA
9. Wake Forest University, Winston-Salem, NC
10. Sports Science Institute, National Collegiate Athletic Association, Indianapolis, IN
11. Athens Technical College, Watkinsville, GA
12. Department of Rehabilitation Medicine and The Sports Institute, University of Washington, Seattle
13. Northwestern University Feinberg School of Medicine, Chicago, IL
14. Section of Prehospital and Disaster Medicine, Department of Emergency Medicine, Emory University School of Medicine, Atlanta, GA
15. Northwestern University, Evanston, IL
16. Barrow County Schools, Winder-Barrow High School, Winder, GA
17. Matthew A. Gfeller Sport-Related Traumatic Brain Injury Research Center, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill
18. Concordia University, Ann Arbor, MI
19. University Health Services, Rutgers Robert Wood Johnson Medical School, Princeton, NJ
20. Harborview Injury Prevention and Research Center and Department of Pediatrics, University of Washington and Seattle Children's Hospital, WA
21. National Football League, New York, NY, Vanderbilt University Medical Center, Nashville, TN
22. University of Massachusetts, Lowell
23. Harborview Injury Prevention and Research Center, Department of Pediatrics, and Department of Anesthesiology, University of Washington, Seattle
24. University of Georgia, Athens