1. University of Washington School of Medicine, Department of Pediatrics, Seattle, WA;
2. Seattle Children's Research Institute, Center for Child Health, Behavior and Development, Seattle, WA;
3. Seattle Children's Research Institute, Center for Clinical and Translational Research, Seattle, WA;
4. University of Washington School of Medicine, Department of Orthopedics and Sports Medicine, Seattle, WA;
5. Seattle Children's Hospital, Orthopedics and Sports Medicine, Seattle, WA;
6. University of Washington, School of Public Health, Seattle, WA;
7. Nationwide Children's Hospital, Sports Medicine, Columbus, OH;
8. Department of Pediatrics and Family Medicine, Ohio State University College of Medicine, Columbus, OH;
9. Children's Hospital of Philadelphia, Sports Medicine and Performance Center, Philadelphia, PA;
10. University of Pennsylvania Perelman School of Medicine, Department of Pediatrics, Philadelphia, PA;
11. David Geffen School of Medicine and UCLA Mattel Children's Hospital, Departments of Pediatrics and Neurosurgery, Los Angeles, CA; and
12. UCLA Steve Tisch BrainSPORT Program, Los Angeles, CA.