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Xiping Feng
Dept. Preventive and Community Dentistry, School of Stomatology, Shanghai Second Medical Univ.
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Chenbin Shu
Dept. Preventive and Community Dentistry, School of Stomatology, Shanghai Second Medical Univ.
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Masaki Kambara
Dept. Preventive and Community Dentistry, Osaka Dental Univ.
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Seigo Nagame
Dept. Preventive and Community Dentistry, Osaka Dental Univ.