1. Department of Epidemiology and International Health, National Center for Global Health and Medicine, Tokyo, Japan;
2. Radiological Diagnosis Department, Hitachi, Ltd., Hitachi Health Care Center, Hitachi, Ibaraki, Japan;
3. Department of Diabetes and Metabolic Medicine, National Center for Global Health and Medicine, Tokyo, Japan;
4. Department of Human Resources Development, National Institute of Public Health, Saitama, Japan.