1. University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USACurrent affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Wisconsin Division of Public Health, Madison, Wisconsin, USA
3. University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USAWisconsin Division of Public Health, Madison, Wisconsin, USACurrent affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Wisconsin State Laboratory of Hygiene, Madison, Wisconsin, USA
5. University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USAWisconsin Division of Public Health, Madison, Wisconsin, USA