Funding for this research was provided by:
National Research Foundation of Korea (NRF-2017R1C1B5075931)
Received: 12 November 2020
Accepted: 7 January 2021
First Online: 18 January 2021
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Kyungpook National University Hospital (IRB No. 2020-07-025) and informed consent was obtained from all patients at the time of the procedure.
: Written informed consent for the individual patient data used in our analysis was waived because of the retrospective nature of the investigation.
: The authors declare that they have no competing interests.