1. Seattle Children’s Research Institute, Seattle, Washington;
2. Harborview Injury Prevention and Research Center, Seattle, Washington;
3. Departments of Epidemiology,
4. The Center on Brain Injury Research and Training, Eugene, Oregon
5. Rehabilitation Medicine,
6. University of Washington Medicine Sports Health and Safety Institute, and
7. University of Washington Medicine Sports Concussion Program, University of Washington, Seattle, Washington; and
8. Pediatrics, and
9. Anesthesiology,