Text and Data Mining valid from 2019-07-30
Received: 26 February 2019
Accepted: 19 July 2019
First Online: 30 July 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Soonchunhyang University Bucheon Hospital (IRB No. SCHBC 2016–10–023-02).
: Not applicable.
: The authors declare that they have no competing interests.