1. School of Agriculture, Utsunomiya University, Utsunomiya, Japan
2. Training and Research Institute of Forestry and Wood Industry, Mongolian University of Science and Technology, Ulaanbaatar, Mongolia
3. Tohoku Regional Office, Forest Tree Breeding Center, Forestry and Forest Products Research Institute, Takizawa, Japan
4. Tochigi Prefectural Forestry Center, Utsunomiya, Japan