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DECLARATIONS
Acknowledgments
We thank Angela Morben, DVM, ELS, from Edanz (https://jp.edanz.com/ac) for editing a draft of this
manuscript.

Authors’ contributions
Made substantial contributions to the conception and design of the study, performed the data analysis and
interpretation, and wrote the manuscript: Ishizawa T
Provided administrative and technical support and critical revisions of the manuscript: Hasegawa K

Availability of data and materials
Not applicable.

Financial support and sponsorship
None.

Conflicts of interest
Both authors declared that there are no conflicts of interest.

Ethical approval and consent to participate
Not applicable.

Consent for publication
Not applicable.

Copyright
© The Author(s) 2021.

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