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Article History

Received: 24 May 2018

Revised: 11 September 2018

Accepted: 1 October 2018

First Online: 9 November 2018

Compliance with ethical standards

:

: The scientific guarantor of this publication is Won-Hee Jee.

: The authors declare that they have no conflict of interest.

: No complex statistical methods were necessary for this paper.

: Written informed consent was obtained from all subjects (patients) in this study.

: Institutional Review Board approval was obtained.

: • retrospective• diagnostic or prognostic study• performed at one institution