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Authors
Okui, Tasuku http://orcid.org/0000-0001-5098-8502
Park, Jinsang
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Funding
Funding for this research was provided by:
japan society for the promotion of science (21K17231)
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Article History
Received: 21 July 2021
Accepted: 14 September 2021
First Online: 20 September 2021
Declarations
:
: Not applicable. We analyzed government statistics data that are publicly available. No administrative permissions were required to access the data used in this study.
: Not applicable.
: The authors have no conflict of interest associated with the material presented in this paper.
