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Yuan, Jun http://orcid.org/0000-0002-2153-3821
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Article History
Received: 17 January 2018
Accepted: 23 April 2018
First Online: 2 May 2018
Ethics approval and consent to participate
: Ethical approval was not applicable for this systematic review and meta-analysis.
: The author declares that he has no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
