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*Hayato Iijima
Graduate School of Agriculture, Hokkaido University
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Hideyuki Saito
Graduate School of Agriculture, Hokkaido University
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Masato Shibuya
Graduate School of Agriculture, Hokkaido University
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Hiroyuki Tanouchi
Research center of Hokkaido, Foresty and Forest Products Research Institute
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Kunihide Takahashi
Graduate School of Agriculture, Hokkaido University