1. Department of Neuropsychiatry; Okayama University Graduate School of Medicine; Okayama Japan
2. Department of Psychiatry; Okayama Red Cross Hospital; Okayama Japan
3. Department of Neurology; Kurashiki Heisei Hospital; Kurashiki Japan
4. Department of Psychiatry; Taiyo Hills Hospital; Takahashi Japan
5. Department of Neurology; Kawasaki Medical School; Kurashiki Japan
6. Department of Psychiatry; Sekizen Hospital; Tsuyama Japan
7. Department of Psychiatry; Zikei Hospital; Okayama Japan
8. Center for Comprehensive Care and Research on Memory Disorders; National Center for Geriatrics and Gerontology; Obu Japan
9. Department of Psychiatry; National Hospital for Geriatric Medicine, NCGG; Obu Japan