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Authors
Okayama, Tatsushi https://orcid.org/0000-0001-6045-4686
Usuda, Kentaro
Okazaki, Emi
Yamanouchi, Yoshio
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Funding
Funding for this research was provided by:
the Ministry of Health, Labour and Welfare, Japan (No. 19GC2004)
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Article History
Received: 17 February 2020
Accepted: 23 October 2020
First Online: 3 November 2020
Ethics approval and consent to participate
: This study used published tabulated data in accordance with the Statistics Act of 2007, Article 33. Therefore, no special ethical review, including informed consent, is required.
: Not applicable.
: The authors declare that they have no competing interests.
