1. Department of Geriatric Psychiatry, National Center for Mental Health, Seoul, Republic of KoreaDepartment of Geriatric Psychiatry, National Center for Mental Health, Seoul, Republic of Korea.
2. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
3. Department of Psychiatry, Evergreen Hospital, Goyang, Republic of Korea.
4. Department of Psychiatry, Changwon Gyeongsang National University Hospital, Changwon, Republic of Korea.
5. Department of Neuropsychiatry, Jeju National University Hospital, Jeju, Republic of Korea.
6. Department of Psychiatry, Dankook University Hospital, Cheonan, Republic of Korea.
7. Department of Neuropsychiatry, Korea University Guro Hospital, Seoul, Republic of Korea.
8. Department of Psychiatry, Wonju Severance Christian Hospital, Wonju, Republic of Korea.
9. Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.
10. Department of Brain and Cognitive Science, Seoul National University College of Natural Sciences, Seoul, Republic of Korea.