Funding for this research was provided by:
the national research foundation of korea grant funded by the korean government (NRF-2020R1F1A1049539)
Received: 11 May 2021
Accepted: 14 August 2021
First Online: 26 August 2021
: This study was approved by the Institutional Review Board of Seoul St. Mary’s Hospital, Seoul, The Catholic University of Korea (No. KC19ZESI0586). Anonymous and deidentified information was used for analysis and, therefore, informed consent was not obtained.
: Not applicable.
: The authors declare that they have no competing interests.