Article History
Received: 5 May 2019
Accepted: 10 October 2019
First Online: 5 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Approval for this study was obtained from the institutional review board of Hanyang University Myongji Hospital (IRB No. MJH 2018-01-009), and the requirement for informed consent was waived because of a retrospective data analysis, for which the study did not involve patients.