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Shinji Shimoji
Department of Periodontology and Endodontology, Division of Oral Health Science, Hokkaido University Faculty of Dental Medicine
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Hiroe Takefu
Department of Periodontology and Endodontology, Division of Oral Health Science, Hokkaido University Faculty of Dental Medicine Clinic of Endodontics and Periodontics, Hokkaido University Hospital
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Tsutomu Sugaya
Department of Periodontology and Endodontology, Division of Oral Health Science, Hokkaido University Faculty of Dental Medicine