1. From the Mountain States Regional Hemophilia and Thrombosis Center, University of Colorado Denver, Aurora (Z.R., A.L.H., T.J.B.); Department of Biostatistics and Informatics, Colorado School of Public Health, Aurora (D.W.); Department of Radiology, Children’s Hospital Colorado, Aurora (L.Z.F., N.V.S.); and Departments of Pediatrics and Pediatric Neurology, Children’s Hospital Colorado, Aurora (E.C.M., T.J.B.).