Text and Data Mining valid from 2019-10-26
Received: 7 June 2019
Accepted: 9 October 2019
First Online: 26 October 2019
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Seoul National University Bundang Hospital Institutional Review Board, and the requirement for informed consent was waived (IRB No. B-1904/534–104).
: Not applicable.
: The author declares that there are no conflicts of interest.