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Authors
Chen, Xinrong
Yang, Kun
Zhang, Xingxia
Li, Ka
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Article History
Received: 12 April 2019
Revised: 14 July 2019
Accepted: 15 July 2019
First Online: 1 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Because this was a meta-analysis that involved no people or animals, the need for ethics approval was waived.
