1. Division of Blood Disorders; National Center on Birth Defects and Developmental Disabilities; Centers for Disease Control and Prevention; Atlanta GA USA
2. University of Michigan Haemophilia and Coagulation Disorders; Ann Arbor MI USA
3. Emory University; Atlanta GA USA
4. Mountain States Regional Haemophilia and Thrombosis Center; University of Colorado and The Children's Hospital; Aurora CO USA
5. Vanderbilt University Medical Center; Nashville TN USA