1. Mountain State Regional Hemophilia and Thrombosis Center, University of Colorado, Aurora, CO, USA
2. Blood Disorders and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA, USA
3. Medicine, University of Pennsylvania, Philadelphia
4. Pediatrics, Oregon Health and Science University, Portland, OR, USA
5. Hemophilia Diagnostic and Treatment Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA