Funding for this research was provided by:
Samsung Medical Center (SMO1180151)
Received: 23 September 2020
Accepted: 25 April 2021
First Online: 28 April 2021
: The Institutional Review Board of Samsung Medical Center approved this study and waived the requirement for informed consent because of the observational nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.