Guo, Xiaoxia
Gong, Ying
Wu, Zhiyuan
Yan, Fuhua
Ding, Xiaoyi
Xu, Xueqin http://orcid.org/0000-0002-1657-6253
Article History
Received: 28 February 2019
Revised: 9 August 2019
Accepted: 9 September 2019
First Online: 3 December 2019
Compliance with ethical standards
:
: The scientific guarantor of this publication is Xueqin Xu.
: 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 not required for this study because this was a retrospective study.
: Institutional Review Board approval was obtained.
: • retrospective• diagnostic or prognostic study• performed at one institution