1. Department of Hygiene, Public Health and Preventive Medicine, Showa University School of Medicine
2. Department of Health Services Research, Faculty of Medicine, University of Tsukuba
3. Department of Epidemiology for Community Health and Medicine, Kyoto Prefectural University of Medicine
4. Department of Preventive Medicine and Public Health, School of Medicine, Keio University
5. Center for Cancer Control and Statistics, Osaka Medical Cancer and Cardiovascular Diseases