1. Department of Psychiatry, College of Medicine, Soonchunhyang University, Cheonan, Republic of Korea.
2. Department of Psychiatry, College of Medicine, Korea University, Seoul, Republic of Korea.
3. Depression Center, Korea University, Seoul, Republic of Korea.
4. Clinical Research Center for Depression, Korea University, Seoul, Republic of Korea.
5. Institute of Human Behavior and Gene, Korea University, Seoul, Republic of Korea.
6. Department of Psychiatry, College of Medicine, Kyunghee University, Seoul, Republic of Korea.