1. Department of Psychiatry, Kangwon National University School of Medicine, Chuncheon, Korea
2. Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Korea
3. Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea
4. Department of Neuropsychiatry, Kyunggi Provincial Hospital for the Elderly, Yongin, Korea
5. Department of Psychiatry, Chungnam National University Hospital, Daejeon, Korea
6. Department of Psychiatry, Konkuk University Chungju Hospital, Chungju, Korea
7. Department of Psychiatry, Gyeongsang National University Hospital, Jinju, Korea
8. Department of Neuropsychiatry, Konkuk University Hospital, Seoul, Korea
9. Department of Neuropsychiatry, Jeju National University Hospital, Jeju, Korea
10. Department of Psychiatry, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea
11. Department of Psychiatry, Jeonju City Welfare Hospital for the Elderly, Jeonju, Korea
12. Department of Psychiatry, Kyungbook National University Hospital, Daegu, Korea
13. Department of Psychiatry, Haeundae Paik Hospital, Busan, Korea
14. Department of Psychiatry, Chuncheon Sacred Hospital, Chuncheon, Korea
15. Department of Psychiatry, Uijeongbu St. Mary’s Hospital, Uijeongbu, Korea
16. Department of Brain and Cognitive Science, Seoul National University College of Natural Sciences, Seoul, Korea
17. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea