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Tomohiko Hirayama
Department of Histology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271–8587, Japan Department of Liberal Arts(Biology), Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271–8587, Japan Research Institute of Oral Science, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271–8587, Japan
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Kunihiro Suzuki
Research Institute of Oral Science, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271–8587, Japan