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Authors
Nakawa, Nagisa https://orcid.org/0000-0001-8890-2575
Uegatani, Yusuke https://orcid.org/0000-0002-6142-6078
Otani, Hiroki https://orcid.org/0000-0001-7308-977X
Fukuda, Hiroto https://orcid.org/0000-0002-4472-4954
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Funding
Funding for this research was provided by:
Japan Society for the Promotion of Science (18K13162)
Japan Society for the Promotion of Science (19K14219)
Japan Society for the Promotion of Science (19K20947)
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Article History
Accepted: 11 April 2023
First Online: 27 May 2023
Declarations
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: There are non-financial interests that are directly or indirectly related to the work submitted for publication.
: Approval was obtained from the preschool. The study was conducted following the guidelines of the ethics committee of Kanto Gakuin University. The procedures used in this study adhered to the tenets of the Declaration of Helsinki.
: Written informed consent was obtained from the parents of the children; we were given consent for publishing the photographs of the children’s faces in any publication for research use.
: The parents of the study participants signed an informed consent for the publication of their children’s data and photographs.
