Funding for this research was provided by:
National Natural Science Foundation of China (81471722,81771887, 81471721,81771897)
Program for Young Scholars and Innovative Research Team in Sichuan Province of China (2017TD0005)
Text and Data Mining valid from 2019-05-27
Received: 13 November 2018
Revised: 25 March 2019
Accepted: 5 April 2019
First Online: 27 May 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Ying-kun Guo.
: The authors report no conflicts of interest.
: No complex statistical methods were necessary for this paper.
: Written informed consent was not required for this study because it is a meta-analysis.
: Institutional Review Board approval was not required because of the meta-analysis study design<b>.</b>
: Study subjects and cohorts have been reported previously as detailed in the methods and results as well as reference.
: • Performed at one institution