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Authors
Ye, Hui
Song, Tiange
Zeng, Xi
Li, Lin
Hou, Minmin
Xi, Mingrong https://orcid.org/0000-0002-6903-0625
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Article History
Received: 7 October 2017
Accepted: 4 March 2018
First Online: 8 March 2018
Compliance with ethical standards
:
: No patient consent or ethical approval was required, because analyses were based on the previous published studies.
: All authors declare that they have no conflict of interest.
