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Authors
Zhang, S. Y.
Wu, J. T.
Zhang, Y. L.
Leng, J. X.
Yang, W. P.
Zhang, Z. G.
Zhao, J. Y.
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Article History
Received: 25 February 2015
Accepted: 16 September 2015
First Online: 13 October 2015
Competing interests
: The authors declare no competing financial interests.
