Funding for this research was provided by:
Japan Science and Technology Agency (JPMJCR17A5 17942099)
Received: 11 September 2020
Accepted: 24 May 2021
First Online: 3 June 2021
: Written informed consent was obtained from all participants. This research was approved by the Medical Ethical Committee of Tokyo Metropolitan Geriatric Hospital. This research was conducted in accordance with the Ethical Guidelines for Epidemiological Research in Japan and the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.