1. Snowy Forest Laboratory, Toyama, Japan
2. Forestry Agency, Tokyo, Japan
3. Woodworks “Yui”, Hachimantai, Japan
4. Tohoku Research Center, Forestry and Forest Products Research Institute, Morioka, Japan
5. Kansai Research Center, Forestry and Forest Products Research Institute, Kyoto, Japan
6. Faculty of Agriculture, Iwate University, Morioka, Japan