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*Tamotsu Hoshino
National Institute of Advanced Industrial Science and Technology Graduate School of Science, Hokkaido University
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Seiichi Fujiu
Graduate School of Science, Hokkaido University
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Yuichi Hanada
Graduate School of Science, Hokkaido University
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Midori Yoshida
National Agricultural Research Center for Hokkaido Region
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Sakae Kudoh
National Institute of Polar Research