1. Division of Medical Education, Department of Medical Education, Tottori University Faculty of Medicine, Yonago 683-8503, Japan
2. Advanced Medicine & Translational Research Center, Organization for Research Initiative and Promotion, Tottori University, Yonago 683-8503, Japan
3. Technical Department, Tottori University, Yonago 683-8503, Japan
4. National Institute of Technology, Yonago College, Yonago 683-8502, Japan
5. Amphibian Research Center, Hiroshima University, Higashi-Hiroshima 739-8526, Japan