1. Department of Neurology, National Hospital Organization, Nagasaki Kawatana Medical Center, Nagasaki, Japan
2. Department of Neurology, Nippon Medical School, Tokyo, Japan
3. Department of Neurology, National Hospital Organization, Hokkaido Medical Center, Sapporo, Japan
4. Neurological Center, Neurology Chiba Clinic, Chiba, Japan
5. Department of Neurology, Neurological Institute, Graduate School of Medicine, Kyushu University, Fukuoka, Japan
6. Department of Neurology, International University of Health and Welfare, Tokyo, Japan
7. Department of Neurology, Tokyo University, Tokyo, Japan
8. Department of Neurology and Neurobiology of Aging, Kanazawa University, Kanazawa, Japan
9. Health Service Center, Kanazawa University, Kanazawa, Japan
10. Department of Neurology, School of Medicine, Teikyo University, Tokyo, Japan
11. Department of Neurology, School of Medicine, Tokyo Women’s Medical University, Tokyo, Japan
12. Department of Neurology, National Hospital Organization, Nagasaki National Hospital, Sakuragi-cho 6-41, Nagasaki 850-8523, Japan