Akita, M., N. Otaki, M. Yokoro, M. Yano, N. Tanino, and K. Fukuo. “Relationship Between Social Activity and Frailty in Japanese Older Women During Restriction on Outings Due to COVID-19”. Canadian Geriatrics Journal, vol. 24, no. 4, Dec. 2021, pp. 320-4, doi:10.5770/cgj.24.507.