1. Department of Oral and Maxillofacial Surgery, Chungbuk National University Hospital, Cheongju, Korea
2. Department of Psychiatry, School of Medicine, Wonkwang University, Iksan, Korea
3. Division of Child and Adolescent Psychiatry, Department of Psychiatry, Graduate School of Medicine, Seoul National University, Seoul, Korea
4. Dental Clinic Center, Chungbuk National University Hospital, Cheongju, Korea