1. Institute for Transfusion Medicine, Pittsburgh, Pennsylvania
2. RTI, Rockville, Maryland
3. National Heart, Lung, and Blood Institute, Bethesda, Maryland
4. BloodCenter of Wisconsin, Milwaukee
5. American Red Cross, Dedham, Massachusetts
6. Blood Systems Research Institute, San Francisco, California
7. University of British Columbia, Victoria, Canada
8. American Red Cross, Farmington, Connecticut