[1] Univ Washington, Dept Neurol, Seattle, WA 98195 USA
[2] Natl Rehabil Ctr Disabled Children, Dept Pediat, Tokyo, Japan
[3] Hosp Sick Children, Dept Genet, Toronto, ON M5G 1X8, Canada
[4] Indiana Univ, Dept Med & Mol Genet, Indianapolis, IN 46204 USA
[5] Natl Ctr Neurosci, NCNP, Dept Neurodegenerat Dis, Tokyo, Japan
[6] Baylor Coll Med, Dept Pediat, Houston, TX 77030 USA
[7] Baylor Coll Med, Dept Mol & Human Genet, Houston, TX 77030 USA