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*Kazuchika Tamura
Hokkaido Univ. Departoment of Dental medicine
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Noriyuki Takashi
Hokkaido Univ. Departoment of Dental medicine
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Tukasa Akasaka
Hokkaido Univ. Departoment of Dental medicine
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Iosif Rosca
Hokkaido Univ. Departoment of Dental medicine
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Motohiro Uo
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Tosi Sugawara
Hokkaido Univ. Departoment of Dental medicine
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Syouji Ookawa
Hokkaido Univ. Departoment of Dental medicine
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Yasunori Totsuka
Hokkaido Univ. Departoment of Dental medicine
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Fumio Watari
Hokkaido Univ. Departoment of Dental medicine