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Authors
Chu, P.
Chen, D. P.
Wang, Y. L.
Xie, Y. L.
Yan, Z. B.
Wan, J. G.
Liu, J.-M.
Li, J. Y.
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Article History
Received: 26 March 2014
Accepted: 1 May 2014
First Online: 21 May 2014
Competing interests
: The authors declare no competing financial interests.
