Article History
Received: 11 April 2018
Revised: 18 June 2018
Accepted: 13 July 2018
First Online: 7 August 2018
Compliance with ethical standards
:
: The scientific guarantor of this publication is Kyung-Yul 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