Received: 5 November 2019
Accepted: 13 March 2020
First Online: 30 March 2020
Ethics approval and consent to participate
: This study utilized secondary data. The 8th Korean Children Panel Survey was conducted after review by the Institutional Review Board of KICCE. The parents provided written consent for their children’s participation in the panel survey. The current work was conducted after review by the Institutional Review Board of C University (no. 1040271–201811-HR-030).
: Not applicable.
: The authors declare that they have no competing interests.