1. Department of Neurology Graduate School of Medical Sciences Kumamoto University 1−1−1 Honjo, Chuo‐ku Kumamoto 860‐8556 Japan
2. Department of Molecular Neurology and Therapeutics Kumamoto University Hospital 1−1−1 Honjo, Chuo‐ku Kumamoto 860‐8556 Japan
3. Department of Neurology National Hospital Organization Nagasaki Kawatana Medical Center 2005‐1 Shimogumigo, Kawatana‐cho, Higashisonogi‐gun Nagasaki 859‐3615 Japan