Funding for this research was provided by:
Japan Society for the Promotion of Science (18K07658)
Tokyo Metropolitan Institute of Gerontology (TR29-10)
Received: 20 May 2020
Accepted: 14 July 2020
First Online: 22 July 2020
Ethics approval and consent to participate
: All applicable institutional and/or national guidelines for the care and use of animals were followed, and the study protocol was approved by the institutional Research Ethics Board.
: Not applicable.
: The authors declare that they have no competing interests.