1. Division of Oral and Maxillofacial Surgery, Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Korea.
2. Graduated School of Clinical Dentistry, Hallym University, Chuncheon, Korea.
3. Institute of Clinical Dentistry, Hallym University, Chuncheon, Korea.
4. Division of Oral and Maxillofacial Surgery, Hallym University Sacred Heart Hospital, Anyang, Korea.