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Article History

Received: 30 May 2018

Revised: 1 September 2018

Accepted: 21 September 2018

First Online: 7 November 2018

Compliance with ethical standards

:

: The scientific guarantor of this publication is Dapeng Shi.

: 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 obtained from all subjects (patients) in this study.

: Institutional Review Board approval was obtained.

: • Retrospective• Diagnostic or prognostic study• Performed at one institution