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Article History

Received: 23 April 2018

Accepted: 10 October 2018

First Online: 18 October 2018

Ethics approval and consent to participate

: All procedures performed in this study were in accordance with the ethical standards of the institutional research committee (the Ethics Committee of Nagasaki University Graduate School of Biomedical Sciences) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The guardians and children were provided with information about the research and all gave written informed consent prior to enrolment.

: Not applicable.

: The authors declare that they have no competing interests.

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