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Authors
Cheng, W. W.
Wang, X. Y.
Sheng, Y. B.
Gong, L. Y.
Zhao, S. M.
Liu, J. M.
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Article History
Received: 19 October 2016
Accepted: 8 January 2017
First Online: 15 February 2017
Competing interests
: The authors declare no competing financial interests.
