Received: 24 April 2019
Accepted: 17 October 2019
First Online: 29 October 2019
Ethics approval and consent to participate
: The Seoul National University Bundang Hospital Institutional Review Board approved the collection and use of the clinical information for research purposes before the investigation was started and waived the requirement for informed consent (IRB No. B1806–486-101).
: Not applicable.
: The authors declare that they have no competing interests.