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Authors
Wang, F.Y.
Li, B.
Li, Y.
Liu, H.
Qu, W.D.
Xu, H.W.
Qi, J.N.
Qin, C.Y.
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Article History
Received: 5 May 2016
Accepted: 12 August 2016
First Online: 7 September 2016
Competing interests
: The authors declare no competing financial interests.
