Harborview Injury Prevention & Research Center (Ms Ennis, Drs Jaffe and Rivara, and Mr Konodi), Department of Rehabilitation Medicine (Ms Ennis and Dr Jaffe), and Department of Pediatrics (Drs Mangione-Smith and Rivara), University of Washington, Seattle; Center for Child Health, Behavior and Development, Seattle Children's Research Institute, Seattle, Washington (Dr Mangione-Smith); and Department of Health Policy and Management and Center for Injury Research and Policy, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (Dr MacKenzie).
Corresponding Author: Stephanie K. Ennis, MS, CCC-SLP, Department of Rehabilitation Medicine, University of Washington, Box 356154, 1959 NE Pacific St, Seattle, WA 98195 ([email protected]).
This work was supported by grant number R21 HD059049-01A1 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development.
The authors thank the medical directors and chart abstractors at all participating sites.
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The authors declare no conflicts of interest.