1. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea
2. Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Korea
3. Department of Neuropsychiatry, Kyunggi Provincial Hospital for the Elderly, Yongin, Korea
4. Department of Psychiatry, School of Medicine, Konkuk University, Konkuk University Medical Center, Seoul, Korea
5. Department of Psychiatry, Jeonju City Welfare Hospital for the Elderly, Jeonju, Korea
6. Department of Psychiatry, Bucheon St. Mary’s Hospital, The Catholic University of Korea College of Medicine, Bucheon, Korea
7. Department of Brain and Cognitive Science, Seoul National University College of Natural Sciences, Seoul, Korea
8. Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea