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Article History

Received: 6 January 2021

Revised: 13 March 2021

Accepted: 19 April 2021

First Online: 30 April 2021

Declarations

:

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Catholic University of Korea and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

: The IRB waived the requirement for informed consent because of the retrospective nature of this study.

: The authors declare no competing interests.