1. Tohoku Research Center, Forestry and Forest Products Research Institute, 92–25 Nabeyashiki, Shimokuriyagawa, Morioka, Iwate 020-0123, Japan
2. Shikoku Research Center, Forestry and Forest Products Research Institute, 2–915 Asakura-Nishimachi, Kochi 780-8077, Japan
3. Department of Forest Vegetation, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan
4. Kansai Research Center, Forestry and Forest Products Research Institute, 68 Nagaikyutaro, Momoyama-cho, Fushimi, Kyoto 612-0855, Japan