1. Department of Clinical Veterinary Medicine, Tottori University, 4-101 Koyma-Minami, Tottori 680-8553, Japan, Omura Toryo Company, Limited, 3-87, Chiyomi, Tottori 680-0911, Japan, Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, 606-8502 Kyoto, Japan, and Department of Materials Science, Faculty of Engineering, Tottori University, 4-101 Koyma-Minami, Tottori 680-8552, Japan