1. Department of Psychiatry, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea
2. Department of Neuropsychiatry, Hanyang University College of Medicine and Institute of Mental Health, Seoul, Korea
3. Department of Neuropsychiatry, Keyo Hospital, Uiwang, Korea
4. Department of Psychiatry, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea