Article History
Received: 7 October 2018
Accepted: 1 May 2019
First Online: 1 June 2019
Ethics approval and consent to participate
: This article was performed under the IRB permission (Seoul National University Bundang Hospital Institutional Review Board No: B-1611/370–303) and informed consent was waived due to the retrospective nature of this study.
: All presented cases in this report had written consents for publication.
: The authors declare that they have no competing interests.
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