Graduate Division of Health and Welfare, Department of Nursing and Human Nutrition, Yamaguchi Prefectural University, Yamaguchi, Japan. Department of Nursing & Health, School of Nursing & Health, Aichi Prefectural University, Nagoya, Aichi, Japan. Department of Dermatology and Connective Tissue Medicine, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan. Faculty of Engineering, Graduate Faculty of Interdisciplinary Research, University of Yamanashi, Kofu, Yamanashi, Japan. Department of Gerontechnology, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan. Department of Nursing & Health, School of Nursing & Health, Aichi Prefectural University, Nagoya, Aichi, Japan; Department of Dermatology and Connective Tissue Medicine, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan. Electronic address: zenzo@ncgg.go.jp.