Funding for this research was provided by:
Seoul National University Bundang Hospital (14-2017-023)
Received: 1 September 2020
Accepted: 11 March 2021
First Online: 7 April 2021
: The study protocol was reviewed and approved by the Seoul National University Bundang Hospital (SNUBH) institutional review board [B-1911/579–104]. The need for consent was waived by the SNUBH institutional review board because it is practically impossible to obtain consent from each participant; there is no reason to presume that the participant refused to consent and, even if the consent is exempted, the risk to the participant is extremely low.
: Not applicable.
: All authors state that they have no competing interests.