Wang, Guangye
Peng, Zhan
Li, Jin
Song, Zukun
Wang, Pu
Article History
Received: 16 April 2019
Accepted: 11 June 2019
First Online: 30 July 2019
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest that could be perceived as prejudicing the impartiality of this study.
: Institutional Review Board approval was not required because we only performed data analysis based on published studies.
: Written informed consent was not required for this study because it is a meta-analysis based on studies that have already been published