1. School of Agriculture, Utsunomiya University, Utsunomiya, Japan
2. United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Japan
3. Training and Research Institute of Forestry and Wood Industry, Mongolian University of Science and Technology, Ulaanbaatar, Mongolia
4. Forestry and Forest Products Research Institute (JSPS Research Fellow), Tsukuba, Japan