Ethics statement

JK Jung Kwon Kim
HL Hak Jong Lee
SH Sung Il Hwang
GC Gheeyoung Choe
HK Hak Ju Kim
SH Sung Kyu Hong
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The Institutional Review Board of Seoul National University Bundang Hospital approved this study (Approval number: B-1706/402-115). A written informed consent of patients was waived by the Institutional Review Board as this was a retrospective study. Personal identifiers were completely deleted such that data were analyzed anonymously. Our study was conducted according to the ethical standards of the 1964 Declaration of Helsinki and its later amendments.

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