1. Research Department, Institute for Health Economics and Policy Association for Health Economics Research and Social Insurance and Welfare Tokyo Japan
2. Department of Health Services Research, Faculty of Medicine University of Tsukuba Tsukuba Japan
3. Department of Geriatric Medicine, Graduate School of Medicine The University of Tokyo Tokyo Japan
4. Yokohama Aobanosato Geriatric Health Services Facility Yokohama Japan
5. Tatsumanosato Geriatric Health Services Facility Daito Japan