1. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Illinois Department of Public Health, Chicago, Illinois, USA
3. Centers for Disease Control and Prevention, Atlanta, Georgia, USARush University, Chicago, Illinois, USA
4. Wisconsin Department of Health and Family Services, Madison, Wisconsin, USA
5. Centers for Disease Control and Prevention, Atlanta, Georgia, USAWisconsin Department of Health and Family Services, Madison, Wisconsin, USA
6. Kansas Department of Health and Environment, Topeka, Kansas, USA
7. Indiana State Department of Health, Indianapolis, Indiana, USA