1 From the Department of Clinical Neurological Sciences (G.B.Y.), University of Western Ontario, London, Canada; and Paediatric Neurology (L.L.T.), Washington University, St. Louis, MO. bryan.young@lhsc.on.ca.
2 From the Department of Clinical Neurological Sciences (G.B.Y.), University of Western Ontario, London, Canada; and Paediatric Neurology (L.L.T.), Washington University, St. Louis, MO.