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Authors
Ding, T. P.
Gao, J. F.
Tian, S. H.
Fan, C. F.
Zhao, Y.
Wan, D. F.
Zhou, J. X.
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Article History
Received: 18 July 2016
Accepted: 2 February 2017
First Online: 8 March 2017
Competing interests
: The authors declare no competing financial interests.
