1. Center for Surveillance, Epidemiology and Laboratory Services, Centers for Disease Control and Prevention, Atlanta, GA, USA
2. National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, GA, USA
3. National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA
4. US Public Health Service Commissioned Corps, Office of the Surgeon General, Washington, DC, USA