Funding for this research was provided by:
Takeda Science Foundation
Ministry of Health, Labour and Welfare
Received: 16 February 2020
Accepted: 8 July 2020
First Online: 16 July 2020
Ethics approval and consent to participate
: This study protocol was approved by the ethics committee of the National Center for Geriatrics and Gerontology (NCGG) of Japan. The design and performance of the current study involving human subjects were clearly described in a research protocol. All participants were volunteers and completed informed consent in writing before registering to the NCGG Biobank.
: Not applicable
: The authors declare that they have no competing interests.