1. Department of Medicine, Francis Owen Blood Research Laboratory, University of North Carolina, Chapel Hill, NC 27516, USA
2. Pathology and Laboratory Medicine, Francis Owen Blood Research Laboratory, University of North Carolina, Chapel Hill, NC 27516, USA
3. Division of Laboratory Animal Medicine, Francis Owen Blood Research Laboratory, University of North Carolina, Chapel Hill, NC 27516, USA
4. Medicine/Hematology/Oncology, University of Pittsburgh Medical Center, Pittsburgh, PA 15261, USA
5. Hemophilia Center of Western PA, Pittsburgh, PA 15213, USA