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Informed consent (assent) was obtained from the children and their parents before they filled the questionnaire. This study was approved by the ethics review board of the University of Toyama and carried out in accordance with the relevant guidelines and regulations (R2018126). This study followed the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guidelines.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"The authors declare no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"Not applicable.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}}],"article-number":"129"}}