Article History
Received: 18 February 2020
Accepted: 7 August 2020
First Online: 20 August 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Institutional Review Board (IRB) of Seoul National University Bundang Hospital (IRB No. B-1707/409–105).
: Not applicable.
: The authors declare that they have no competing interests.