1. Department of Gerontological Nursing/Wound Care Management, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
2. Global Nursing Research Center, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
3. Department of Health Services Research, Institute of Medicine, University of Tsukuba, Tsukuba, Japan
4. Department of Clinical Epidemiology and Health Economics, School of Public Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan