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Authors
Wang, S. M.
Cheng, Q. Q.
Gong, Y. X.
Xu, P.
Sun, C.
Li, L.
Li, T.
Zhu, S. N.
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Article History
Received: 5 February 2016
Accepted: 1 April 2016
First Online: 4 May 2016
Competing interests
: The authors declare no competing financial interests.
