1. Department of Psychiatry, Chung-Ang University College of Medicine, Seoul, Korea
2. Department of Psychiatry, College of Medicine, Kyung Hee University, Seoul, Korea
3. Department of Psychiatry, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea
4. Department of Psychiatry, Wonkwang University School of Medicine, Iksan, Korea
5. Department of Psychiatry, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea
6. Department of Psychiatry, Iksan Hospital, Iksan, Korea
7. Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Korea