Funding for this research was provided by:
National Research Foundation of Korea (2019R1G1A1089358)
Received: 12 April 2021
Accepted: 5 July 2021
First Online: 10 July 2021
: Patient consent was waived by Institutional Review Boards due to the retrospective nature of the study.
: All authors have read and approved the final manuscript.
: The authors declare that they have no competing interests.