1. Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, MD;
2. Knopp Biosciences, Pittsburgh, PA;
3. Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases,
4. Department of Laboratory Medicine, Clinical Center,
5. Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, and
6. Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD