Received: 23 February 2021
Accepted: 2 March 2021
First Online: 10 March 2021
: The study protocol was reviewed and approved by the institutional review board of the Asan Medical Center (IRB approval No. S2019-0054-0001), and consent was obtained from all patients before operation.
: Consent forms of all patients were obtained before operation.
: The authors declare that they have no competing interests.