1. Department of Geriatric Medicine, Graduate School of Medicine The University of Tokyo Tokyo Japan
2. Research Department Institute for Health Economics and Policy, Association for Health Economics Research and Social Insurance and Welfare Tokyo Japan
3. Department of Home Care Medicine, Graduate School of Medicine The University of Tokyo Tokyo Japan
4. Tatsumanosato Geriatric Health Services Facility Daito Japan
5. Department of Respiratory Medicine Jichi Medical University Saitama Medical Center Saitama Japan