1. Division of Intramural Research (M.E.C.), National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD.
2. Clinical Division of Haematology and Haemostaseology, Department of Medicine I, Medical University of Vienna, Austria (M.E.C.).
3. Experimental Hematology and Cancer Biology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH (B.E.T.).
4. Laboratory of Vascular Thrombosis and Inflammation, Intramural Research Program (Y.K.), National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD.