1. Department of Psychiatry and Behavioral Science, Institute of Human Behavioral Medicine, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Psychiatry, Gachon Medical School, Incheon, Korea.
3. Department of Psychiatry, Office of Medical Education, Institute of Human Behavioral Medicine, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Psychiatry, Kangwon National University College of Medicine, Chunchon, Korea.