1. Centers for Disease Control and Prevention, Office of Public Health Scientific Services, Atlanta, GA, USA
2. Centers for Disease Control and Prevention, Center for Surveillance, Epidemiology and Laboratory Services, Atlanta, GA, USA
3. Centers for Disease Control and Prevention, National Center for Health Statistics, Rockville, MD, USA
4. Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Diseases, Atlanta, GA, USA
5. Centers for Disease Control and Prevention, National Center for Environmental Health, Atlanta, GA, USA
6. Centers for Disease Control and Prevention, Office of the Director, Atlanta, GA, USA