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*Yuichi Yamaura
Graduate School of Agriculture, Hokkaido University
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Hiroyasu Oka
Department of Forest Policy and Economics, Forestry and Forest Products Research Institute
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Hisatomo Taki
Department of Forest Entomology, Forestry and Forest Products Research Institute
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Kenichi Ozaki
Hokkaido Research Center, Forestry and Forest Products Research Institute
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Hiroshi Tanaka
Department of Forest Vegetation, Forestry and Forest Products Research Institute