1. Department of Clinical Neuroscience Yamagata University Graduate School of Medicine Yamagata Japan
2. Department of Speech, Language and Hearing Sciences Niigata University of Health and Welfare Niigata Japan
3. Division of Community Medicine Faculty of Medicine Tohoku Medical and Pharmaceutical University Miyagi Japan
4. Department of Neurology Kohnan Hospital Sendai Japan
5. Department of Neurology National Hospital Organization Yonezawa Hospital Yamagata Japan
6. Department of Behavioral Neurology and Cognitive Neuroscience Tohoku University Graduate School of Medicine Sendai Japan