Article History
Received: 15 May 2018
Revised: 31 July 2018
Accepted: 27 August 2018
First Online: 25 September 2018
Compliance with ethical standards
:
: The scientific guarantor of this publication is Kwanseop Lee.
: 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.
: No complex statistical methods were necessary for this paper.
: Written informed consent was waived by the Institutional Review Board.
: Institutional Review Board approval was obtained.
: • retrospective• diagnostic or prognostic study• performed at one institution