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Authors
Rui, W. B.
Hu, Y.
Du, A.
You, B.
Xiao, M. W.
Zhang, W.
Zhou, S. M.
Du, J.
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Article History
Received: 21 May 2015
Accepted: 3 August 2015
First Online: 8 September 2015
Competing interests
: The authors declare no competing financial interests.
