Received: 10 June 2020
Accepted: 7 October 2020
First Online: 4 November 2020
Ethics approval and consent to participate
: Approval for the study was obtained from the institutional review board on human subjects research and the ethics committee, Hanyang University Hospital (Institutional Review Board File No. 2016-06-032-001). Owing to the retrospective nature of the study, the need for informed consent was waived by the institutional review board of Hanyang University Hospital. All individual records were anonymized prior to analysis.
: Not applicable.
: The authors declare that they have no competing interests.