Funding for this research was provided by:
National Natural Science Foundation of China (81471658)
Article History
Received: 20 July 2018
Revised: 24 December 2018
Accepted: 4 February 2019
First Online: 15 March 2019
Compliance with ethical standards
:
: The scientific guarantor of this publication is Bin Song.
: 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 study is based on the published studies to perform the meta-analysis.
: Institutional Review Board approval was not required because this study is based on the published studies to perform data analysis.
: • retrospective• diagnostic or prognostic study• performed at one institution