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*Mitsuteru Akiba
Kyushu research center, Forestry and forest products research institute
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Makoto Ishihara
Kyushu research center, Forestry and forest products research institute
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Katsunori Nakamura
Kyushu research center, Forestry and forest products research institute
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Norio Sahashi
Kyushu research center, Forestry and forest products research institute
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Takashi Mori
Faculty of Agriculture, University of the Ryukyus
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Atsushi Mikami
Faculty of Agriculture, University of the Ryukyus
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Norikazu Kameyama
Faculty of Agriculture, University of the Ryukyus