Funding for this research was provided by:
National Research Foundation of Korea (2019R1F1A1060978, 2019R1C1C1004017)
ministry of health and warfare (HI16C1559)
Received: 5 August 2020
Accepted: 11 February 2021
First Online: 19 February 2021
Ethics approval and consent to participate
: Institutional review board of CHA medical center approved this study. (CHAMC 2019–10–044-003).
: <i>Informed consent was waived because</i> of the <i>retrospective</i> nature of the study and the analysis used anonymous clinical data.
: The authors declare that they have no competing interests.