Funding for this research was provided by:
The National Natural Science Foundation of China (81360172)
Article History
Received: 20 September 2019
Accepted: 20 January 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: Because this meta-analysis did not involve identifiable patient information, investigational review board approval was not necessary.
: N/A.
: The authors declare that they have no competing interests.