Department of Molecular Pathology, Osaka University Graduate School of Medicine and Health Science, Osaka, Japan. Department of Molecular-Targeting Cancer Prevention, Kyoto Prefectural University of Medicine, Kyoto, Japan. Epidemiology and Prevention Group, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan. Email: mimutoh@ncc.go.jp Department of Public Health, Wakayama Medical University School of Medicine, Wakayama, Japan. Faculty of Nutrition, University of Kochi, Kochi, Japan. Department of Hygiene and Preventive Medicine, Osaka University Graduate School of Medicine, Osaka, Japan. Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan.