1. Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
2. Division of Pathology, National Institute of Health Sciences, Kawasaki City, Kanagawa 210-9501, Japan
3. Department of Chemistry, Kanagawa Institute of Technology, Atsugi, Kanagawa 243-0292, Japan
4. Division of Carcinogenesis and Cancer Prevention, National Cancer Center Research Institute, Tokyo 104-0045, Japan