Funding for this research was provided by:
Korea Health Industry Development Institute (HI14C3451)
Received: 9 December 2020
Accepted: 31 July 2021
First Online: 31 August 2021
: This study was approved by the Institution of Review Board of Seoul National University Hospital (IRB No. H1509-030-702) and written informed consents were obtained from parents or guardians on behalf of participants.
: Not applicable.
: The authors declare that they have no competing interests.