[1] Tohoku Univ, Grad Sch Med, Dept Neurol, Sendai, Miyagi 980, Japan
[2] Univ Sao Paulo, Fac Med, Dept Neurol, Sao Paulo, Brazil
[3] Tohoku Univ, Grad Sch Med, Dept Multiple Sclerosis Therapeut, Sendai, Miyagi 980, Japan
[4] Stanford Univ, Dept Pediat Neurol & Neurol Sci, Stanford, CA 94305 USA