Funding for this research was provided by:
Korea Environmental Industry and Technology Institute (2018001350001)
Received: 12 April 2020
Accepted: 7 July 2021
First Online: 27 July 2021
: This study protocol was approved by the Medical Center Institutional Review Board of Daegu Catholic University (IRB No. CUIRB-2016-011) and was conducted in accordance with the ethical principles for medical research involving human subjects, as defined by the Helsinki Declaration. Study participants provided written informed consent. The consent to participate was obtained from the parents/guardians of the minors (children) included in this study.
: Not applicable.
: The authors declare that they have no competing interests.