1 Department of Neurology, Teikyo University School of Medicine, Tokyo 173-8606, Japan.
2 Department of Neurology, Teikyo University School of Medicine, Tokyo 173-8606, Japan. Electronic address: k1-hokkoku@hotmail.co.jp.
3 Department of Neurology, Teikyo University School of Medicine, Tokyo 173-8606, Japan. Electronic address: y-uchida@med.teikyo-u.ac.jp.
4 Department of Neurology, Teikyo University School of Medicine, Tokyo 173-8606, Japan. Electronic address: tk-chiba@med.teikyo-u.ac.jp.
5 Department of Neurology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
6 Department of Neurology, Teikyo University School of Medicine, Tokyo 173-8606, Japan. Electronic address: y-hata@med.teikyo-u.ac.jp.
7 Department of Neurology, Teikyo University School of Medicine, Tokyo 173-8606, Japan. Electronic address: sonoom@med.teikyo-u.ac.jp.
8 Department of Physical Therapy, Tokyo University of Technology, 5-23-22, Nishikamata, Ota-ku, Tokyo 144-8535, Japan; Department of Neurology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan. Electronic address: jshimizu-tky@umin.net.