1. Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD;
2. Hematology Department, Alaska Native Tribal Health Consortium, Anchorage, AK;
3. Hospital Sao Jose – Hospital Beneficencia Portuguesa de Sao Paulo, Sao Paulo, Brazil;
4. Nursing Research and Translational Science, National Institutes of Health, Bethesda, MD;
5. Laboratory Medicine, National Institutes of Health, Bethesda, MD; and
6. Office of Biostatistics Research, National Heart, Lung, and Blood Institute, Bethesda, MD