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Authors
Yan, J. H.
Liu, P.
Lin, Z. Y.
Wang, H.
Chen, H. J.
Wang, C. X.
Yang, G. W.
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Article History
Received: 18 December 2014
Accepted: 24 March 2015
First Online: 5 May 2015
Competing interests
: The authors declare no competing financial interests.
