1. Blood Research Institute, Blood Center of Wisconsin, Milwaukee, WI;
2. Department of Pediatrics, Medical College of Wisconsin, Children's Research Institute, Children's Hospital of Wisconsin, Milwaukee, WI;
3. Division of Hematology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA;
4. Department of Biochemistry and Molecular Biology, St Louis University School of Medicine, St Louis, MO;
5. Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA;
6. Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA; and
7. Center for Thrombosis and Hemostasis, Mainz, Germany