Funding for this research was provided by:
ministry of education, science and technology (2016M3C7A1914123)
Received: 20 July 2021
Accepted: 19 October 2021
First Online: 5 November 2021
: Study approval by Institutional Review Board of Severance Hospital was obtained before the study initiation (No. 1-2019-0095). Written informed consent was obtained from all participants and their primary caregivers.
: Not applicable.
: The authors declare that they have no competing interests.