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Authors
Ma, X.
Zhao, Y. F.
Tian, W. J.
Qian, Z.
Chen, H. W.
Wu, Y. Y.
Liu, X. F.
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Article History
Received: 8 June 2016
Accepted: 21 September 2016
First Online: 10 October 2016
Competing interests
: The authors declare no competing financial interests.
