Akita, Michiko, Naoto Otaki, Miyuki Yokoro, Megumu Yano, Norikazu Tanino, and Keisuke Fukuo. 2021. “Relationship Between Social Activity and Frailty in Japanese Older Women During Restriction on Outings Due to COVID-19”. Canadian Geriatrics Journal 24 (4). Markham, Canada:320-24. https://doi.org/10.5770/cgj.24.507.