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*Satoshi Kitaoka
JSPS Research Fellow Hokkaido Research Center, Forestry and Forest Products Research Institute
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Tadashi Sakata
Hokkaido Research Center, Forestry and Forest Products Research Institute
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Hiroyuki Tobita
Hokkaido Research Center, Forestry and Forest Products Research Institute
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Akira Uemura
Hokkaido Research Center, Forestry and Forest Products Research Institute
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Mitsutoshi Kitao
Hokkaido Research Center, Forestry and Forest Products Research Institute
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Yutaka Maruyama
Forestry and Forest Products Research Institute
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Kaichiro Sasa
FSC, Hokkadio University Forest
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Takayoshi Koike
Graduate School of Agriculture, Hokkaido University
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Hagime Utsugi
Hokkaido Research Center, Forestry and Forest Products Research Institute