Department of Molecular-Targeting Prevention, Kyoto Prefectural University of Medicine, Kyoto 602-0841, Japan. Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo 104-0045, Japan. Center for Integrated Medical Research, Hiroshima University Hospital, Hiroshima 734-8551, Japan. Central Radioisotope Division, National Cancer Center Research Institute, Tokyo 104-0045, Japan. Department of Food Sciences and Human Nutrition, Ryukoku University, Shiga 520-2194, Japan. Department of Public Health, Wakayama Medical University School of Medicine, Wakayama 641-8509, Japan. Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka 422-8526, Japan. Department of Drug Discovery Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan. Ishikawa Gastroenterology Clinic, Osaka 541-0042, Japan.