[1] Kyushu Univ, Neurol Inst, Grad Sch Med Sci, Dept Neurol,Higashi Ku, 3-1-1 Maidashi, Fukuoka, Fukuoka 8128582, Japan
[2] Kyushu Univ, Grad Sch Med Sci, Neurol Inst, Dept Neuropathol, 3-1-1 Maidashi, Fukuoka, Fukuoka, Japan
[3] Tohoku Univ, Dept Neurol, Sch Med, Sendai, Miyagi, Japan
[4] Natl Hosp Org Miyagi Hosp, Dept Neurol, Sendai, Miyagi, Japan
[5] Natl Hosp Org Yonezawa Hosp, Dept Neurol, Yonezawa, Yamagata, Japan