1. Human Care Research Team Tokyo Metropolitan Institute of Gerontology Tokyo Japan
2. The Salvation Army Booth Memorial Hospital Tokyo Japan
3. Research Department Institute for Health Economics and Policy, Association for Health Economics Research and Social Insurance and Welfare Tokyo Japan
4. Health Services Research and Development Center University of Tsukuba Tsukuba Japan
5. Panalgo Boston Massachusetts USA
6. Department of Health Services Research, Faculty of Medicine University of Tsukuba Tsukuba Japan