1. Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh Pittsburgh Pennsylvania
2. Division of Pulmonary, Allergy and Critical Care Medicine, Department of MedicineUniversity of Pittsburgh Pittsburgh Pennsylvania
3. Blood Systems Research Institute, San Francisco, and Department of Laboratory MedicineUniversity of California San Francisco California
4. RTI International Atlanta Georgia
5. RTI International Research Triangle Park North Carolina
6. RTI International Rockville Maryland
7. American Red Cross Blood Services Dedham Massachusetts
8. American Red Cross Farmington Connecticut
9. Department of PathologyUniversity of Pittsburgh Pittsburgh Pennsylvania
10. The Institute for Transfusion Medicine Pittsburgh Pennsylvania
11. University of British Columbia Victoria British Columbia Canada
12. Blood Research Institute, Blood Center of Wisconsin, and Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin Milwaukee