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Authors
Toyama, Chiyoshi https://orcid.org/0000-0001-5171-5899
Masahata, Kazunori
Ibuka, Souji
Nara, Keigo
Soh, Hideki
Usui, Noriaki
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Article History
Accepted: 17 March 2021
First Online: 25 March 2021
Declarations
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: The authors declare no conflicts of interest relevant to the content of this article.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from the parents or legal guardians of all participants included in the study.
