1. American Red Cross Scientific Support Office, Gaithersburg, Maryland
2. Gen-Probe, San Diego, California
3. Lab of Molecular Virology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland
4. Wadsworth Center, Albany, New York
5. Blood Systems Research Institute, San Francisco, California
6. Blood Systems, Inc, Scottsdale, Arizona
7. Westat, Rockville, Maryland
8. Epoch Biosciences, Bothell, Washington
9. University Health Network, Toronto, Canada
10. Department of Laboratory Medicine
11. Department of Medicine, University of California, San Francisco