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Authors
Yan, L. L.
Wan, W.
Chen, L.
Zhou, F.
Gong, S. J.
Tong, X.
Feng, M.
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Article History
Received: 10 November 2015
Accepted: 27 January 2016
First Online: 11 February 2016
Competing interests
: The authors declare no competing financial interests.
