1. Department of Psychiatry, School of Medicine, Konkuk University, Chungju, Korea
2. Department of Psychiatry, Hallym University Sacred Heart Hospital, College of Medicine, Hallym University, Anyang, Korea
3. Department of Psychiatry, Soonchunhyang University Cheonan Hospital, Soonchunhyang University, Cheonan, Korea
4. Department of Psychiatry, Soonchunhyang University Gumi Hospital, Soonchunhyang University, Gumi, Korea
5. Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Korea
6. Department of Psychiatry, Iksan Hospital, Iksan, Korea
7. Department of Psychiatry, Keyo Hospital, Uiwang, Korea
8. Department of Psychiatry, Chung-Ang University Hospital, College of Medicine, Chung-Ang University, Seoul, Korea