1. Department of Psychiatry, Yonsei University College of Medicine, Seoul, Korea.
2. Section of Affect and Neuroscience, Institute of Behavioural Science in Medicine, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Psychiatry, Cheil General Hospital & Women's Healthcare Center, Kwandong University College of Medicine, Seoul, Korea.
4. Department of Psychiatry, Ilsan Hospital, National Health Insurance Corporation, Goyang, Korea.
5. Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea.