*Division of Pediatric Neurology, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT and †Department of Neurology, Boston Children's Hospital, Boston, MA.

Address correspondence and reprint requests to Joshua L. Bonkowsky, MD, PhD, Division of Pediatric Neurology, Department of Pediatrics, University of Utah School of Medicine, 295 Chipeta Way/Williams Building Salt Lake City, Utah 84158. E-mail: [email protected].