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Authors
Li, X. P.
Xia, Q.
Qu, D.
Wu, T. C.
Yang, D. G.
Hao, W. D.
Jiang, X.
Li, X. M.
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Article History
Received: 11 July 2014
Accepted: 15 October 2014
First Online: 4 November 2014
Competing interests
: The authors declare no competing financial interests.
