1. Department of Psychiatry, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
2. Department of Psychiatry, Uijeongbu St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Uijeongbu, Korea.
3. Suicide and School Mental Health Institute, Hallym University, Anyang, Korea.
4. Department of Psychiatry, Hallym University Sacred Heart Hospital, Anyang, Korea.