1. School of Agriculture, Utsunomiya University, Utsunomiya, Japan
2. United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
3. Training and Research Institute of Forestry and Wood Industry, Mongolian University of Science and Technology, Ulaanbaatar, Mongolia
4. Forest Tree Breeding Center, Forestry and Forest Products Research Institute, Hitachi, Ibaraki, Japan
5. School of Industrial Technology, Mongolian University of Science and Technology, Ulaanbaatar, Mongolia