Funding for this research was provided by:
National Natural Science Foundation of China (81870336, 81870336)
Article History
Received: 23 September 2019
Accepted: 5 January 2020
First Online: 16 January 2020
Compliance with ethical standards
:
: All authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript, including employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties. Peer reviewers on this manuscript have no relevant financial relationships to disclose.
: This article does not contain any studies with human participants or animals performed by any of the authors. We admit that this meta-analysis is complied with ethical standards. Since this is a meta-analysis based on the published articles, therefore the ethical approval is not applicable.