1. Department of Preventive Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Center for School Mental Health, Eulji University, Seoul, Korea.
3. Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Department of Psychiatry, Incheon St. Mary’s Hospital, Incheon, Korea.
5. Department of Psychiatry, Seoul St. Mary’s Hospital, Seoul, Korea.