1. Michael Dolan Fliss is with the University of North Carolina Injury Prevention Research Center, Chapel Hill, and the North Carolina Department of Health & Human Services, Division of Public Health, Injury & Violence Prevention Branch. Mary E. Cox is with the North Carolina Department of Health & Human Services, Division of Public Health, Injury & Violence Prevention Branch. Samantha W. Dorris and Anna E. Austin are with the University of North Carolina Injury Prevention Research Center.