[1] Stanford Univ, Dept Neurol & Neurol Sci, Palo Alto, CA USA
[2] Childrens Hosp, Dept Pediat Neurol, Fukuoka, Fukuoka, Japan
[3] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Pediat, Seoul, South Korea
[4] Univ Libre Bruxelles, Hop Univ Enfants Reine Fabiola, Pediat Neurol, Brussels, Belgium
[5] Eisai Europe Ltd, Biostat, Emea, Hatfield, Herts, England
[6] Eisai Inc, Clin Res, Nutley, NJ USA