Received: 4 March 2021
Accepted: 4 July 2021
First Online: 16 July 2021
: This study was approved by the Institutional Review Board and Hospital Research Ethics Committee of Severance Hospital, Yonsei University Health System, Seoul, Korea (IRB number: 4–2020-0221). Due to the retrospective nature of the study, the requirement for informed consent from patients was waived.
: Not applicable.
: The authors declare that they have no competing interests.