1. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea
2. Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea
3. Department of Neuropsychiatry, Jeju National University Hospital, Jeju, Korea
4. Health Equity Research Center, People's Health Institute, Seoul, Korea
5. Department of Psychiatry, Gyeongsang National University Hospital, Jinju, Korea
6. Department of Neuropsychiatry, Gwangju Inkwang Dementia Hospital, Gwangju, Korea
7. Department of Psychiatry, Chungnam National University Hospital, Daejeon, Korea
8. Department of Psychiatry, Konkuk University Chungju Hospital, Chungju, Korea
9. Department of Psychiatry, Inha University Hospital, Incheon, Korea
10. Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Korea
11. Department of Neuropsychiatry, Konkuk University Hospital, Seoul, Korea
12. Department of Neuropsychiatry, Kyunggi Provincial Hospital for the Elderly, Yongin, Korea
13. Department of Psychiatry, Jeonju City Welfare Hospital for the Elderly, Jeonju, Korea
14. Department of Neuropsychiatry, Inje University Snaggye Paik Hospital, Seoul, Korea
15. Department of Psychiatry, Dankook University Hospital, Cheonan, Korea
16. Department of Psychiatry, Kyungbook National University Hospital, Daegu, Korea
17. Department of Psychiatry, Seoul National University Boramae Hospital, Seoul, Korea
18. Department of Psychiatry, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
19. Department of Neuropsychiatry, Kangwon National University Hospital, Chuncheon, Korea