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Article History

Received: 29 February 2020

Revised: 1 August 2020

Accepted: 17 September 2020

First Online: 30 September 2020

Compliance with ethical standards

:

: The scientific guarantor of this publication is Ying Gong.

: 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