| Affiliation: | 1. McKusick‐Nathans Institute of Genetic Medicine, School of Medicine, Johns Hopkins University, , Baltimore, Maryland;2. Department of Pediatrics, Division of Pediatric Hematology, School of Medicine, Johns Hopkins University, , Baltimore, Maryland;3. Division of Blood Disorders, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, , Atlanta, Georgia;4. Department of Pediatrics, Vanderbilt University School of Medicine, , Nashville, Tennessee |
