[1] Tohoku Med & Pharmaceut Univ, Dept Neurol, Sendai, Miyagi, Japan
[2] Tohoku Univ, Grad Sch Med, Dept Neurol, Sendai, Miyagi, Japan
[3] Natl Hosp Org Yonezawa Natl Hosp, Dept Neurol, Yonezawa, Yamagata, Japan
[4] Tohoku Univ, Grad Sch Med, Dept Multiple Sclerosis Therapeut, Sendai, Miyagi, Japan
[5] Fukushima Med Univ, Dept Multiple Sclerosis Therapeut, Sch Med, Koriyama, Fukushima, Japan
[6] Southern Tohoku Res Inst Neurosci, Multiple Sclerosis & Neuromyelitis Opt Ctr, Koriyama, Fukushima, Japan