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Article History

Received: 16 June 2020

Accepted: 29 July 2020

First Online: 3 August 2020

Compliance with ethical standards

:

: All authors declare no conflict of interest regarding the preparation of the manuscript. No funding source is applicable to any part of this study.

: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

: Approved by the institutional review board of Anam Hospital of Korea University Medical Center.