1. Centers for Disease Control and Prevention, Agency for Toxic Substances and Disease Registry, Division of Health Studies, Atlanta, GA
2. New York State Department of Health, Center for Environmental Health, Division of Environmental Health Assessment, Bureau of Toxic Substance Assessment, National Toxic Substance Incidents Program, Troy, NY
3. Minnesota Department of Health, Environmental Health Division, Hazardous Substances Emergency Events Surveillance Program, St. Paul, MN
4. Michigan Department of Community Health, Division of Environmental Health, Lansing, MI