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Authors
Ishikawa, Shin-ichi https://orcid.org/0000-0002-6961-3484
Kishida, Kohei
Oka, Takuya
Saito, Aya
Shimotsu, Sakie
Watanabe, Norio
Sasamori, Hiroki
Kamio, Yoko
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Funding
Funding for this research was provided by:
Japan Society for the Promotion of Science (JP15H03516, JP26590267)
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Article History
Received: 30 October 2018
Accepted: 25 October 2019
First Online: 13 November 2019
Ethics approval and consent to participate
: All performed procedures were in accordance with the ethical standards and approved by the institutional research committees of the first (17002) and the third author (A2016-035). The principals of the two elementary schools agreed to participate in the study. Only the data that were obtained through an opt-out consent process from the students’ parents were analyzed.
: Not applicable.
: The authors declare that they have no competing interests.
