1. From the Department of Neurology (M.R.G.), Division of Pediatric Neurology, Indiana University School of Medicine, Indianapolis, IN; the Departments of Neurology and Pediatrics (H.J.F.), University of California, San Francisco, Calif; Department of Pediatric Hematology/Oncology (U.N.-G.), University Children’s Hospital, University of Münster, Münster, Germany; and the Department of Neurology (G.d.V.), Hospital for Sick Children, Toronto, Ontario, Canada.