1. Department of Neurology, Gunma University Graduate School of Medicine, Maebashi, Japan
2. Department of Social Medicine, Hirosaki University School of Medicine, Hirosaki, Japan
3. Department of Neurology, Geriatrics Research Institute and Hospital, Maebashi, Japan
4. Bioanalysis Department, LSI Medience Corporation, Itabashi-ku, Tokyo, Japan
5. Department of Stress Response Science, Hirosaki University Graduate School of Medicine, Hirosaki, Japan