Takamichi Kanbayashi1, Yuki Hatanaka2, Masahiro Sonoo2. 1. Department of Neurology, Teikyo University School of Medicine, Kaga 2-11-1, Itabashi-ku, Tokyo, 1738605, Japan. ta_kanba@yahoo.co.jp. 2. Department of Neurology, Teikyo University School of Medicine, Kaga 2-11-1, Itabashi-ku, Tokyo, 1738605, Japan.