1. Division of Unintentional Injury, National Centers for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, Georgia
2. School of Public Health, Georgia State University, Atlanta
3. Division of Human Development and Disability, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia
4. Division of Analysis, Research and Practice Integration, Centers for Disease Control and Prevention, Atlanta, Georgia