1 The Harborview Injury Prevention and Research Center, Departments of Pediatrics and Epidemiology, University of Washington, Seattle.
2 Center for Child Health, Behavior and Development, Seattle Children's Research Institute, Seattle, Washington.
3 David Geffen School of Medicine, Departments of Pediatrics and Neurosurgery, University of California, Los Angeles Steve Tisch Brain SPORT program, University of California, Los Angeles Mattel Children's Hospital, Los Angeles.
4 Departments of Pediatrics and Psychiatry and Behavioral Sciences, George Washington University School of Medicine, Washington, DC.
5 Children's National Health System, Rockville, Maryland.