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Authors
Yang, Y.
Fu, X. L.
Wang, S.
Liu, Z. Y.
Ye, Y. F.
Sun, B. A.
Liu, C. T.
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Article History
Received: 7 July 2014
Accepted: 1 October 2014
First Online: 21 October 2014
Competing interests
: The authors declare no competing financial interests.
