1 Department of Neurology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
2 Department of Neurology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan. Electronic address: yaguchi-h@pop.med.hokudai.ac.jp.
3 Department of Neurology, Gifu University Graduate School of Medicine, Gifu, Japan.
4 Department of Animal Model Development, Brain Research Institute, Niigata University, Niigata, Japan.
5 Department of Neurology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan. Electronic address: yabe@med.hokudai.ac.jp.