1. Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi 409-3898, Japan
2. Laboratory of Veterinary Anatomy, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan
3. Department of Mathematics and Statistics, Faculty of Medicine, Oita University, Oita 879-5593, Japan
4. Laboratory of Veterinary Biochemistry, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan