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Authors
Li, C. Q.
Xu, D. K.
Wang, B. J.
Sheng, L. Y.
Qiao, Y. X.
Han, E. H.
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Article History
Received: 5 October 2016
Accepted: 30 November 2016
First Online: 5 January 2017
Competing interests
: The authors declare no competing financial interests.
