Kim, Kyoung Min http://orcid.org/0000-0003-0577-0701
Chung, Un Sun
Article History
Received: 8 December 2019
Accepted: 23 September 2020
First Online: 3 October 2020
Compliance with ethical standards
:
: The authors have no potential conflicts of interest to disclose.
: This study was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments, and approved by the Institutional Review Board of the Korean Institute of Child Care of Education.
: We provided the parents of participating children with information on the purpose and procedure of the study, and all gave their written informed consent before participating.