Received: 25 August 2020
Accepted: 20 January 2021
First Online: 25 January 2021
Ethics approval and consent to participate
: This study utilized secondary data. The 10th Korean Children Panel Survey was conducted after review by the Institutional Review Board of KICCE. The subjects provided written consent for their children’s participation in the panel survey. In addition, the present study was performed after approval from the Institutional Bioethics Committee of Kyung Hee University (Approval Number: KHSIRB20–097). Data used in this paper are public and anonymous.
: Not applicable.
: The authors declare no conflict of interest.