Department of Neurology (C.A.M.M., M.C.A., A.T.Q.S.M.F., C.G.C., A.M.S.S., U.C.R., E.Z.), School of Medicine, Universidade de São Paulo (FMUSP), Brazil; Department of Physical Therapy (G.C.M., F.C.S., C.R.F.A.), Speech Language and Hearing Science Adn Occupational Therapy, School of Medicine, Universidade de São Paulo (FMUSP), Brazil; Neuromuscular and Neurogenetic Disorders of Childhood Section (S.D., C.B.), National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD; Department of Neurology, Hospital Santa Marcelina (L.D.J.), São Paulo, Brazil; and Department of Pathology (O.L.A.-N.), Division of Neuropathology, University of Pittsburgh Medical Center, Pittsburgh, PA.