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Authors
Xiong, Y. Q.
Zhou, W. P.
Li, Q.
Cao, Q. Q.
Tang, T.
Wang, D. H.
Du, Y. W.
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Article History
Received: 13 March 2015
Accepted: 7 July 2015
First Online: 4 August 2015
Competing interests
: The authors declare no competing financial interests.
