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Yoshio Uchikawa
Divisino of Preventive Dentistry, The Nippon Dental University, School of Dentistry at Tokyo
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Tomonobu Okumura
Divisino of Preventive Dentistry, The Nippon Dental University, School of Dentistry at Tokyo
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Hisayoshi Tanaka
Department of Endodontics, The Nippon Dental University, School of Dentistry at Tokyo