Transition to frailty in older Japanese people during the coronavirus disease 2019 pandemic: a prospective cohort study 論文 Tomoyuki Shinohara・Kosuke Saida・Shigeya Tanaka・Akihiko Murayama・Daisuke Higuchi ·2021-10-21 ·『Archives of Gerontology and Geriatrics』 98 pp. 104562-104562 doi:10.1016/j.archger.2021.104562