Article History
Received: 3 June 2021
Accepted: 3 July 2021
First Online: 19 July 2021
Declarations
:
: All authors have no conflict of interest to declare.
: All study protocols were in accordance with the principles of the Helsinki Declaration. We removed personal identifiers and anonymized all data, which exempted the study from the need to obtain informed consent from patients. Institutional review board (IRB) approval of study from Seoul National University Bundang Hospital was obtained (IRB number: B-2007-622-102).