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*Kyoko Ikawa
Division of Preventive Dentistry, Department of Oral Health and Development Sciences Tohoku University Graduate School of Dentistry
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Motohide Ikawa
Division of Periodontology and Endodontology, Department of Oral Biology Tohoku University Graduate School of Dentistry
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Takeyoshi Koseki
Division of Preventive Dentistry, Department of Oral Health and Development Sciences Tohoku University Graduate School of Dentistry