1. Department of Community Health Nursing, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
2. Department of Health Promotion Science, Osaka University Graduate School of Medicine, Osaka, Japan
3. Department of Gerontological Homecare and Long-term Care Nursing, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
4. Faculty of Nursing and Medical Care, Graduate School of Health Management, Keio University, Kanagawa, Japan