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Authors
Sun, A-Ping https://orcid.org/0000-0002-7189-5046
Liu, Na
Zhang, Ying-Shuang
Zhao, Hai-Yan
Liu, Xiao-Lu
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Article History
Received: 27 September 2019
Accepted: 18 December 2019
First Online: 2 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: As a systematic review and meta-analysis, no ethical approval or consent to participate was required.
: All data reported in this manuscript are found in the literature as cited in the text.
