Funding for this research was provided by:
Japan Society for the Promotion of Science (15500503, 12770037, 17500493, 19300235)
Received: 28 September 2020
Accepted: 15 February 2021
First Online: 23 February 2021
Ethics approval and consent to participate
: All procedures were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study protocol was approved by the ethics committee of Tokyo Metropolitan Institute of Gerontology (ID: 1219). Informed consent was provided by all individual participants included in the study.
: Not applicable.
: The authors have no conflicts of interest relevant to the content of this manuscript.