Received: 2 July 2020
Accepted: 3 September 2020
First Online: 17 September 2020
Ethics approval and consent to participate
: The study was approved by the institutional review board of Seoul National University Bundang Hospital (B-1805/468–101). and the requirement for informed consent was waived due to the retrospective design of the study. The collected data was anonymized before its use.
: Not applicable.
: There are no conflicts of interest to declare.