Article History
Received: 6 November 2018
Revised: 21 December 2018
Accepted: 30 January 2019
First Online: 11 March 2019
Compliance with ethical standards
:
: The scientific guarantor of this publication is Myeong-Jin Kim.
: The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
: Nieun Seo performed statistical analysis, who is one of the coauthors. Ha Yan Kim, Ph.D., who is a member of our biostatistics collaboration unit, Yonsei University College of Medicine, gave us advice on the statistical analysis.
: Written informed consent was waived by the Institutional Review Board for this retrospective case-control study.
: Institutional Review Board approval was obtained.
: • retrospective• diagnostic or prognostic study• performed at one institution