1. Department of Psychiatry, Seoul National University College of Medicine, Seoul, South Korea
2. Department of Psychiatry, Mood Disorders Clinic, Seoul National University Hospital, Seoul, South Korea
3. Department of Psychiatry, Mood Disorders Clinic, Seoul National University Bundang Hospital, Seongnam, South Korea
4. Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, South Korea