1. Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute and
2. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA;
3. Blood Systems Research Institute, San Francisco, CA;
4. Department of Laboratory Medicine, University of California, San Francisco, CA;
5. RTI International, Atlanta, GA;
6. RTI International, Research Triangle Park, NC;
7. RTI International, Rockville, MD;
8. Blood Research Institute, Blood Center of Wisconsin, Milwaukee, WI;
9. Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, WI;
10. American Red Cross, Farmington, CT;
11. Department of Pathology, University of Pittsburgh, Pittsburgh, PA;
12. The Institute for Transfusion Medicine, Pittsburgh, PA; and
13. University of British Columbia, Victoria, BC, Canada