1. Departments of Anesthesiology and Pain Medicine,
2. Center for Clinical and Epidemiological Research,
3. Pediatrics,
4. Epidemiology,
5. Harborview Injury Prevention and Research Center, University of Washington, Seattle, Washington; and
6. Rehabilitation Medicine,
7. Neurologic Surgery, and
8. Department of Emergency Medicine, Children’s Hospital of Philadelphia and the University of Pennsylvania, Philadelphia, Pennsylvania
9. Biostatistics,