1 Sapporo Neurology Hospital, Japan; Department of Neurology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
2 Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
3 Sapporo Neurology Hospital, Japan; Department of Neurology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan. Electronic address: yaguchi-h@pop.med.hokudai.ac.jp.
4 Sapporo Neurology Hospital, Japan.
5 Sapporo Neurology Hospital, Japan. Electronic address: fukazawa@ceres21.jp.
6 Department of Neurology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan. Electronic address: yabe@med.hokudai.ac.jp.