Article History
Received: 2 April 2020
Accepted: 7 October 2020
First Online: 19 October 2020
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: This study was approved by the Institutional Review Boards of Korea University Medical Center (KUGH17256). Institutional Review Boards of Korea University Medical Center allows the use of medical record without informed consent where data are fully anonymized.
: Not applicable.
: Not applicable.
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