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Authors
An, Y
Zhang, Z
Shang, Y
Jiang, X
Dong, J
Yu, P
Nie, Y
Zhao, Q
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Article History
Received: 15 January 2015
Revised: 16 March 2015
Accepted: 23 March 2015
First Online: 21 May 2015
Competing interests
: The authors declare no conflict of interest.
