Funding for this research was provided by:
Health Insurance Review and Assessment Service
Received: 26 June 2020
Accepted: 14 October 2020
First Online: 20 October 2020
Ethics approval and consent to participate
: The work described has been carried out in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki) for experiments involving humans. The institutional review board of the Seoul National University Hospital approved this study (No. 1812–103-995). Written informed consent was obtained from a parent or legal guardian.
: Not applicable.
: The authors declare no conflicts of interest.