1Department of Oral and Maxillofacial Surgery II, Osaka University, Graduate School of Dentistry, 1-8 Yamada-oka, Suita, Osaka 565-0871, Japan
2Radiation Oncology Research Laboratory, Research Reactor Institute, Kyoto University, Noda, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
3Radiation Life Science, Research Reactor Institute, Kyoto University Noda, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
4Department of Oral and Maxillofacial Surgery, Izumisano Municipal Hospital, Rinku General Medical Center, 2-23 Rinku Ourai-kita, Izumisano,Osaka 598-0048, Japan
5Department of Neurosurgery, Kyoto Prefectural Medical University 465 Kajii-cho, Hirokoji-agaru, Kawara-machi, Kamigyo-ku, Kyoto 602-8566, Japan
6Department of Agriculture and Life Science, Osaka Prefectural University 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan