1. Department of Basic Geriatrics; Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
2. Department of Dental Medicine; Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
3. Department of Food Science and Biotechnology; Hiroshima Institute of Technology; Hiroshima Japan
4. Department of Anatomy and Neurobiology; Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kawaramachi-Hirokoji, Kamikyo-ku Kyoto 602-8566 Japan