1. Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki
2. Heisei Medical Welfare Research Institute, Tokyo
3. Department of Social Science, Research Institute, National Center for Geriatrics and Gerontology, Obu
4. Department of Health Services Research, Faculty of Medicine, University of Tsukuba, Ibaraki
5. Global Nursing Research Center, Graduate School of Medicine, University of Tokyo
6. Department of Preventive Medicine and Community Health, School of Medicine, University of Occupational and Environmental Health, Kitakyushu