1. Research DepartmentInstitute for Health Economics and Policy, Association for Health Economics Research and Social Insurance and Welfare Tokyo Japan
2. Department of Geriatric Medicine, Graduate School of MedicineThe University of Tokyo Tokyo Japan
3. Department of Health Services Research, Faculty of MedicineUniversity of Tsukuba Tsukuba Japan
4. Health Services Research & Development CenterUniversity of Tsukuba Tsukuba Japan
5. Tatsumanosato Geriatric Health Services Facility Daito Japan