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Authors
Kim, Jung Kwon
Kim, Hwanik
Lee, Hakmin
Oh, Jong Jin
Lee, Sangchul
Hong, Sung Kyu
Kwak, Cheol
Byun, Seok-Soo
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Article History
Received: 28 January 2021
Accepted: 6 May 2021
First Online: 24 May 2021
Declarations
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: This study was approved by the institutional review board of Seoul National University Bundang Hospital (Approval number: B-2007-625-102). The patients’ consent was waived due to the retrospective nature and minimal risk to the subjects approved by the institutional review board of Seoul National University Bundang Hospital. Our study was conducted according to ethical standards recommended by the 1964 Declaration of Helsinki and its later amendments.
: Not applicable.
: The authors declare that they have no competing interests.
