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Authors
Zhou, P. X.
Dong, S.
Liu, H. M.
Ma, C. Y.
Yan, Z. B.
Zhong, C. G.
Liu, J. -M.
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Article History
Received: 4 February 2015
Accepted: 9 July 2015
First Online: 13 August 2015
Competing interests
: The authors declare no competing financial interests.
