1. Department of Psychiatry, Kyung Hee University Hospital, Seoul, Korea.
2. Department of Psychiatry, Soonchunhyang University Hospital, Seoul, Korea.
3. Department of Psychiatry, Myongji Hospital, Goyang, Korea.
4. Department of Psychiatry, Keimyung University College of Medicine, Daegu, Korea.
5. Department of Psychiatry, Jeju National University College of Medicine, Jeju, Korea.
6. Department of Psychiatry, Chonbuk National University College of Medicine, Jeonju, Korea.
7. Department of Psychiatry, Kyung Hee University School of Medicine, Seoul, Korea.