Funding for this research was provided by:
Soonchunhyang University (1)
Text and Data Mining valid from 2020-02-12
Received: 13 June 2019
Accepted: 5 December 2019
First Online: 12 February 2020
Ethics approval and consent to participate
: The Institutional Review Board of Soonchunhyang University Hospital approved the study (approval no. 2018–11-019). The requirement for informed consent for this study was waived by the institutional review board because researchers only accessed the database for analysis purposes and personal identifying information was not accessed.
: Not applicable.
: The authors declare that they have no competing interests.