1. Laboratory of Wildlife Biology, Obihiro University of Agriculture and Veterinary Medicine , Obihiro 080-8555 , Japan
2. Laboratory of Wildlife Ecology, Department of Life Science, Tunghai University , Taichung, 407 , Taiwan
3. Laboratory Animal Center, Osaka City University Medical School , Abeno-ku, Osaka 545-8585 , Japan
4. Division of Natural History, Department of Zoological Science, College of Bioresource Sciences, Nihon University , Fujisawa 252-0880 , Japan
5. Taiwan Biodiversity Research Institute , Chichi 552005 , Taiwan
6. Department of Health and Nutrition, The University of Shimane , Izumo 693 - 8550 , Japan
7. Department of Anatomy, School of Dentistry, Aichi Gakuin University , Nagoya 464-8650 , Japan