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Shoichi Ichikawa
Nihon University Graduate School of Dentistry at Matsudo, Special Needs Dentistry, Matsudo, Chiba 271–8587, Japan
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Manabu Yaguchi
Department of Special Needs Dentistry, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271–8587, Japan
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Yoko Tanaka
Department of Special Needs Dentistry, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271–8587, Japan