1 Department of Neurology, Boston Children's Hospital, Boston, Massachusetts; Department of Psychiatry, Boston Children's Hospital, Boston, Massachusetts; Department of Radiology, Boston Children's Hospital, Boston, Massachusetts; Department of Neurology, Harvard Medical School, Boston, Massachusetts. Electronic address: michael.rivkin@childrens.harvard.edu.
2 Department of Pediatrics, Hemophilia and Thrombosis Center, Aurora, Colorado; Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado.
3 Division of Pediatric Neurology, University of Texas Southwestern Medical Center Dallas, Dallas, Texas; Department of Pediatrics, University of Texas Southwestern Medical Center Dallas, Dallas, Texas; Department of Neurology, University of Texas Southwestern Medical Center Dallas, Dallas, Texas.
4 Department of Neurology, Seattle Children's Hospital, Seattle, Washington; Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington.