[1] NINDS, NIH, Bethesda, MD 20892 USA
[2] Loma Linda Univ, Sch Med, Dept Pediat, Loma Linda, CA USA
[3] No Illinois Univ, Dept Biol Sci, De Kalb, IL 60115 USA
[4] Izaak Walton Killam Hosp Children, Dept Pediat Neurol, Halifax, NS B3J 3G9, Canada
[5] Childrens Hosp Pittsburgh, Dept Neurol, Pittsburgh, PA USA
[6] Montefiore Med Ctr, Albert Einstein Coll Med, Dept Pediat, Bronx, NY 10467 USA
[7] Montefiore Med Ctr, Albert Einstein Coll Med, Dept Neurol, Bronx, NY 10467 USA