1. Department of Maxillofacial Surgery, School of Dentistry, Aichi-Gakuin University, 2-11 Suemori-Dori, Chikusa, Nagoya, Aichi 464-8651, Japan
2. Department of Maxillofacial Surgery, Okazaki City Hospital, 3-1 Goshoai, Koryujicho, Okazaki, Aichi 444-8553, Japan