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Authors
Song, X. F.
Hu, L. F.
Li, D. H.
Chen, L.
Sun, Q. Q.
Zhou, P.
Zhang, D. W.
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Article History
Received: 11 August 2015
Accepted: 6 October 2015
First Online: 2 November 2015
Competing interests
: The authors declare no competing financial interests.
