1. Centers for Disease Control and Prevention, Atlanta, GA, USA
2. Bureau of Public Health Laboratories, Jacksonville, FL, USA
3. State Laboratory Division, Hawaii Department of Health, Pearl City, HI, USA
4. Michigan Department of Community Health, Lansing, MI, USA
5. Maryland Department of Health, Baltimore, MD, USA
6. Present address: Department of Public Health, Rocky Hill, CT, USA.
7. Minnesota Department of Health, St. Paul, MN, USA
8. Mississippi Public Health Laboratories, Jackson, MS, USA
9. Nebraska Public Health Laboratory, Omaha, NE, USA
10. New York City Department of Health and Mental Hygiene, New York City, NY, USA
11. Association of Public Health Laboratories, Silver Spring, MD, USA