1. Wisconsin Department of Health Services, Bureau of Environmental and Occupational Health, Madison, WI, USA;
2. CDC/CSTE Applied Epidemiology Fellowship, Madison, WI, USA;
3. Wisconsin Environmental Public Health Tracking (EPHT) Program, Madison, WI, USA;
4. Department of Population Health Sciences, University of Wisconsin-Madison, Madison, WI, USA;
5. Wisconsin Poison Center, Milwaukee, WI, USA