1 Division of Pediatric Neurology (MAV, ANS), Department of Pediatrics, and Department of Neurology (JY, FDE), University of Florida College of Medicine, Gainesville; Department of Medical Imaging (LN), University of Arizona, Tucson; Department of Neurology (TSY), Barrow Neurological Institute, Phoenix, AZ; Department of Medicine (PT-F), Inova Fairfax Medical Campus, Falls Church, VA; and Department of Neurology (PT-F), Johns Hopkins University, Baltimore, MD.