1. Tennessee Department of Health, Division of Laboratory Services, Nashville, TN 37243, USA
2. College of Health Sciences & Public Policy, Walden University, Minneapolis, MN 55401, USA
3. Tennessee Department of Health, Division of Laboratory Services, Knoxville, TN 37920, USA
4. Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
5. Illinois Department of Public Health, Chicago, IL 60612, USA
6. Maryland Department of Health, Baltimore, MD 21205, USA
7. Virginia Department of General Services, Division of Consolidated Laboratory Services, Richmond, VA 23219, USA
8. Minnesota Department of Health, St. Paul, MN 55155, USA
9. Michigan Department of Health & Human Services, Lansing, MI 48906, USA
10. Missouri State Public Health Laboratory, Jefferson City, MO 65101, USA
11. Department of Pathology, Indiana University, Indianapolis, IN 46202, USA
12. Kansas Health and Environmental Laboratories, Topeka, KS 66620, USA
13. California Department of Public Health, Richmond, CA 94804, USA
14. Wadsworth Center, New York State Department of Health, Albany, NY 12208, USA
15. Ohio Department of Health, Reynoldsburg, OH 43068, USA