Received: 3 February 2022
Accepted: 28 March 2022
First Online: 9 May 2022
: The Korean Frailty and Aging Cohort Study (KFACS) protocol was approved by the Institutional Review Board (IRB) of the Clinical Research Ethics Committee of Kyung-Hee University Medical Center (IRB no. 2015–12-103), and all participants provided written informed consent. The study was conducted in accordance with the ethical standards of the Declaration of Helsinki.
: There are no details of individual participants in the manuscript.
: The authors declare that they have no competing interests.