1. Division of Preparedness and Emerging Infections, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
2. Public Health and Healthcare Program, Oak Ridge Associated Universities , Oak Ridge, Tennessee , USA
3. Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
4. Office of the Deputy Director for Infectious Diseases, Centers for Disease Control and Prevention , Atlanta, Georgia , USA