1. Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Korea.
2. Department of Psychiatry and Behavioral Science, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Psychiatry, School of Medicine, Wonkwang University, Iksan, Korea.
5. Department of Psychiatry, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
6. Department of Psychiatry, Soonchunhyang University Cheonan Hospital, Soonchunhyang University, Cheonan, Korea.
7. Department of Psychiatry, Kyung Hee University College of Medicine, Seoul, Korea.
8. Department of Neuropsychiatry, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
9. Department of Psychiatry, Gachon University Gil Medical Center, Incheon, Korea.
10. Department of Psychiatry, Yonsei University Wonju College of Medicine, Wonju, Korea.
11. Deparmtent of Sociology, Seoul National University College of Social Sciences, Seoul, Korea.
12. Department of Social and Preventive Medicine, Sungkyunkwan University College of Medicine, Suwon, Korea.
13. Department of Psychology, Chungbuk National University College of Social Sciences, Cheongju, Korea.
14. Department of Psychiatry, Depression Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.