Figueroa, Rafael, Satoshi Seino, Noriko Yabushita, Yoshiro Okubo, Miyuki Nemoto, Songee Jung, and Kiyoji Tanaka. 2015. “Cross-Validity and Reliability of the Age Scale for Assessing Activities of Daily Living Among Japanese Community-Dwelling Adults Aged 75 Years or Older”. Journal of Aging and Gerontology 3 (1):17-23. https://doi.org/10.12974/2309-6128.2015.03.01.3.