Funding for this research was provided by:
the National Research Foundation of Korea (Korea government (MSIT): 2018R1C1B5046096)
Received: 9 August 2020
Accepted: 2 February 2021
First Online: 6 February 2021
Ethics approval and consent to participate
: This study was approved by the institutional review board (IRB) of Sangye Paik hospital and Ewha Womans’ University Mok-dong hospital. (No. 2020–06-024) The requirement for informed consent was waived by the approving authority in view of the use of anonymized patient information.
: Not applicable.
: The authors declare that they have no competing interests.