Funding for this research was provided by:
Soonchunhyang University (KR) Research Fund
Received: 13 April 2020
Accepted: 6 April 2021
First Online: 15 April 2021
: This study was approved by the Institutional Review Board (IRB) of Soonchunhyang University Bucheon Hospital (IRB No. 2020–01–016-001).The requirement for informed consent was waived because the data in this database were de-identified.
: Not Applicable.
: No potential conflict of interest relevant to this article was reported.