Tanei, Ryoji http://orcid.org/0000-0003-3774-2561
Article History
First Online: 21 February 2020
Compliance with Ethical Standards
:
: This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sector.
: The authors declare no conflict of interest.
: The Medical Ethics Committee of Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology gave approval to conduct this study (No.260301).