1. Research Department, Institute for Health Economics and Policy, Tokyo, Japan
2. Taito Hospital, Tokyo, Japan
3. Department of Health Policy and Management, School of Medicine, Keio University, Tokyo, Japan
4. Japan Association for Development of Community Medicine, Tokyo, Japan
5. Uenohara Municipal Hospital, Yamanashi, Japan
6. Department of Home Care Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan