[1] Tohoku Univ, Grad Sch Med, Dept Neurol, Sendai, Miyagi, Japan
[2] Tohoku Univ Hosp, Dept Educ & Support Reg Med, Sendai, Miyagi, Japan
[3] Tohoku Med & Pharmaceut Univ, Dept Neurol, Sendai, Miyagi, Japan
[4] Natl Hosp Org Yonezawa Natl Hosp, Dept Neurol, Yonezawa, Yamagata, Japan
[5] Fukushima Med Univ, Dept Multiple Sclerosis Therapeut, Fukushima, Japan