Funding for this research was provided by:
National Research Foundation of Korea
Received: 3 June 2020
Accepted: 30 November 2020
First Online: 7 December 2020
Ethics approval and consent to participate
: Our study protocol, including the use of the institutional database was approved by the Institutional Review Board of Gyeongsang National University Hospital (IRB No. GNUH 2020–04-020) and all procedures were done in accordance with the Declaration of Helsinki. Informed consent was exempted due to the retrospective format of this study.
: Not applicable.
: All authors declare that there is no actual or potential conflict of interest.