Article History
Received: 31 May 2020
Revised: 26 November 2020
Accepted: 4 December 2020
First Online: 6 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by the institutional review board (IRB) of Seoul National University Bundang Hospital (IRB identification number: B-2003-601-106) and was conducted as per the tenets of the Declaration of Helsinki.
: The requirement of informed consent was waived by the review board.
: Not applicable.
: Not applicable.