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Authors
Lu, Y. M.
Sun, B. A.
Zhao, L. Z.
Wang, W. H.
Pan, M. X.
Liu, C. T.
Yang, Y.
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Article History
Received: 12 April 2016
Accepted: 2 June 2016
First Online: 21 June 2016
Competing interests
: The authors declare no competing financial interests.
