1. Department of Medicine Mercy Catholic Medical Center Darby Pennsylvania USA
2. Department of Medicine, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
3. Department of Pathology and Laboratory Medicine Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
4. Public Health Programs and Surveillance American Thrombosis and Hemostasis Network ATHN USA
5. Center for Bleeding and Clotting Disorders University of Minnesota Minneapolis Minnesota USA
6. Eli Lilly and Company Indianapolis Indiana USA
7. Center for Clinical Epidemiology and Biostatistics University of Pennsylvania Philadelphia Pennsylvania USA