1. Deborah M. Stone, Kristin M. Holland, Brad Bartholow, Joseph E. Logan, Wendy LiKamWa McIntosh, and Aimee Trudeau are with the Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, GA. Ian R. H. Rockett is with the Department of Epidemiology, School of Public Health, and the Injury Control Research Center, West Virginia University, Morgantown.