Funding for this research was provided by:
Yonsei University College of Medicine (6-2018-0068)
National Research Foundation of Korea (NRF2020R1F1A1076154, NRF2018R1D1A1B07049386)
Korea Health Industry Development Institute (HI18C1159)
2020 Research Grant of Gangnam Severance Hospital Research Committee
Received: 7 August 2020
Accepted: 20 October 2020
First Online: 31 October 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board of Gangnam Severance Hospital (Ref# 3-2017-0054), and written informed consent was obtained from all participants and/or their legal guardians. All procedures performed in this study were in accordance with the ethical standards of the 1964 Helsinki Declaration and its later amendments.
: Not applicable
: The authors declare that they have no competing interests.