Received: 9 September 2020
Accepted: 20 October 2020
First Online: 29 October 2020
Ethics approval and consent to participate
: This study was conducted in accordance with the amended Declaration of Helsinki. The Institutional Review Board of Hallym University Sacred Heart Hospital approved the study protocol, and informed consent was waived due to the retrospective nature of the study (HALLYM 2020–07–006-001).
: Not applicable.
: The authors have declared that no competing interests exist.