1. From the Department of Neurology (C.M.d.G., A.L.R.P.), Boston Children's Hospital, Harvard Medical School, MA; Neurology Department (C.M.d.G., L.S-M.), HC-FCM, University of Campinas, UNICAMP, Campinas, São Paulo, Brazil; Department of Neurology (I.P.d.B.), Children's Hospital of Philadelphia, PA; and Education Unit (L.S-M.), UCL Institute of Neurology, University College London, UK.