1. Department of Gerontological Home Care and Long‐Term Care Nursing, Division of Health Sciences and Nursing, Graduate School of Medicine The University of Tokyo Bunkyo‐city Tokyo Japan
2. Department of Public Health Nursing Tohoku University Graduate School of Medicine Sendai‐city Miyagi Japan
3. Department of Health Sciences Saitama Prefectural University Koshigaya‐city Saitama Japan
4. Brain Attack Center Ota Memorial Hospital Fukuyama‐city Hiroshima Japan