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Authors
Bi, H
Li, S
Qu, X
Wang, M
Bai, X
Xu, Z
Ao, X
Jia, Z
Jiang, X
Yang, Y
Wu, H
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Article History
Received: 25 April 2015
Revised: 24 July 2015
Accepted: 28 July 2015
First Online: 24 September 2015
Competing interests
: The authors declare no conflict of interest.
