1. Department of Oral and Maxillofacial Radiology, Aichi-Gakuin University School of Dentistry, Nagoya, Japan
2. Department of Dentmaxillofacial Diagnosis and Treatment , Kanagawa Dental University, Yokosuka, Japan
3. Division of Radiological Technology, Dental Hospital, Aichi-Gakuin University, Nagoya, Japan
4. Department of Oral Radiology, Asahi University School of Dentistry, Hozumi, Japan