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