1. Department of Psychiatry, Chonnam National University Medical School, Gwangju, Korea.
2. Department of Psychiatry, Keimyung University School of Medicine, Daegu, Korea.
3. Department of Psychiatry, College of Medicine, Korea University, Seoul, Korea.
4. Department of Preventive Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
5. Department of Psychiatry, The Catholic University of Korea College of Medicine, Seoul, Korea.