Received: 18 March 2019
Accepted: 3 August 2020
First Online: 17 August 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board of Seoul National University Bundang Hospital (IRB number: B-1708-412-104), which waived informed consent because of its retrospective design.
: Not applicable.
: The authors declare that they have no competing interests.