1. Forestry and Forest Products Research Institute Ibaraki Japan
2. Isotope Facility for Agricultural Education and Research, Graduate School of Agricultural and Life Sciences The University of Tokyo Tokyo Japan
3. Shikoku Research Center Forestry and Forest Products Research Institute Kochi Japan
4. Kyushu Research Center Forestry and Forest Products Research Institute Kumamoto Japan
5. Tohoku Research Center Forestry and Forest Products Research Institute Morioka Japan
6. Faculty of Engineering, Department of Environment and Energy Tohoku Institute of Technology Sendai Japan
7. Faculty of Agriculture, Department of Forest and Environmental Science University of Miyazaki Miyazaki Japan