1. Department of Oral and Maxillofacial Radiology, Aichi Gakuin University School of Dentistry, Nagoya, Japan
2. Department of Oral and Maxillofacial Surgery, Ogaki Municipal Hospital, Ogaki, Japan
3. Department of Oral Radiology, Asahi University School of Dentistry, Mizuho, Japan
4. Department of Electrical, Electronic and Computer Engineering, Gifu University, Gifu, Japan