Dr. Dafna Kanny, conducted this study while serving as an Epidemic Intelligence Service (EIS) Officer at the Division of Unintentional Injury Prevention (NCIPC), Centers for Disease Control and Prevention (CDC), Atlanta, GA, USA. She is now with the Chronic Disease, Injury, and Environmental Epidemiology, Georgia Division of Public Health, Atlanta, GA, USA (DKanny@dhr.state.ga.us).

Dr. Richard A. Schieber is with the Division of Unintentional Injury Prevention, National Center for Injury Prevention and Control (NCIPC), Centers for Disease Control and Prevention (CDC), Atlanta, GA, USA.

Ms. Vickie Pryor at the time of the study was with the Division of Emergency Medical Services, Florida Department of Health, Tallahassee, FL, USA.

Ms. Marcie-jo Kresnow is with the Office of Statistics and Programming, National Center for Injury Prevention and Control (NCIPC), Centers for Disease Control and Prevention (CDC), Atlanta, GA, USA.