[1] Fukuoka Univ, Dept Neurol, Johnan Ku, Fukuoka 8140180, Japan
[2] Kokura Mem Hosp, Dept Neurol, Fukuoka, Japan
[3] Kyushu Univ, Neurol Inst, Grad Sch Med Sci, Dept Neurol, Fukuoka 812, Japan
[4] Kyushu Kosei Nenkin Hosp, Dept Neurol, Fukuoka, Japan
[5] Shinfuji Hosp, Dept Neurol, Shizuoka, Japan
[6] Mayo Clin, Dept Neurosci, Jacksonville, FL 32224 USA