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Authors
Song, Myung Jin
Lee, Sang Hoon
Jung, Ji Ye
Kang, Young Ae
Park, Moo Suk
Kim, Young Sam
Chang, Joon
Kim, Song Yee
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Article History
Received: 4 January 2021
Accepted: 26 April 2021
First Online: 3 May 2021
Declarations
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: The Institutional Review Board (IRB) and Ethics Committee of Severance Hospital approved this study (number: 4-2018-0435). The need for written informed consent was waived by the IRB due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.
