[1] Kurume Univ, Sch Med, Dept Pediat & Child Hlth, Kurume, Fukuoka 8300011, Japan
[2] Kurume Univ, Sch Med, Inst Brain Res, Kurume, Fukuoka 830, Japan
[3] Univ Tokushima, Sch Med, Dept Pediat, Tokushima 770, Japan
[4] Kuopio Univ Hosp, Dept Child Neurol, Kuopio, Finland
[5] Univ Alabama, Dept Pediat, Div Child Neurol, Birmingham, AL USA