A national infrastructure for rare blood disorders: An evaluation of staffing, training, and services in the US federally-supported hemophilia treatment centres

^*New England Hemophilia Center Worcester, Worcester, MA, U.S.A.; ^†University of Pennsylvania Medical Center-Presbyterian, Philadelphia, PA, U.S.A.; ^‡University of Colorado at Denver & Health Sciences Center, Aurora, CO, U.S.A.; ^§Children’s Hospital of Los Angeles, Los Angeles, CA, U.S.A.; ^§The Children's Mercy Hospital, Kansas City, MO, U.S.A.; ^**Mount Sinai School of Medicine, New York, NY, U.S.A.; and ^††Gulf States Hemophilia and Thrombophilia Center, Austin, TX, U.S.A.