1. Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyungpook National University, Daegu, Korea.
2. Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyungpook National University, Daegu, Korea.
3. Department of Oral and Maxillofacial Radiology, School of Dentistry, Chonnam National University, Gwangju, Korea.