Funding for this research was provided by:
Japan Society for the Promotion of Science (JP17K19869)
Received: 14 July 2020
Accepted: 29 March 2021
First Online: 9 April 2021
: The study protocol was approved by the Ethics Committee of the Tokyo Metropolitan Institute of Gerontology (H28–73). Written informed consent was obtained from all participants and their representatives prior to the investigation.
: Consent for publication was obtained from all participants and their representatives.
: The authors declare that they have no competing interests.