Figueroa, R., S. Seino, N. Yabushita, Y. Okubo, Y. Osuka, M. Nemoto, S. Jung, and K. Tanaka. “Age Scale for Assessing Activities of Daily Living”. International Journal of Statistics in Medical Research, vol. 4, no. 1, Jan. 2015, pp. 48-56, doi:10.6000/1929-6029.2015.04.01.5.