Received: 5 June 2021
Accepted: 23 November 2021
First Online: 7 December 2021
: The study was approved by Ethics Committee (IRB no. B-2010-642-103) in the Seoul National University Bundang Hospital. As this was a retrospective chart review, the requirement to obtain individual consent was waived by the Research Ethics Board.
: Not applicable.
: The authors declare that they have no competing interests.