1 Department of Neurology, Brain Research Institute, Niigata University, 1-757 Asahimachidori, Chuo-ku, Niigata City, Niigata, 951-8585, Japan.
2 Department of Neurology, Brain Research Institute, Niigata University, 1-757 Asahimachidori, Chuo-ku, Niigata City, Niigata, 951-8585, Japan. hata.m@bri.niigata-u.ac.jp.
3 Faculty of Health Sciences, Hokkaido University, Kita 12, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan.