Received: 17 June 2021
Accepted: 24 September 2021
First Online: 6 October 2021
: This study was conducted in accordance with the amended Declaration of Helsinki. The study protocol was approved by the Institutional Review Board of Seoul National University Hospital and informed consent was waived due to its retrospective design posing minimal risk to the study participants (IRB No. 2104-094-1211).
: Not applicable.
: The authors declare that they have no competing interests.