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Authors
Li, Y
Qin, X
Xie, D
Tang, G
Xing, H
Li, Z
Xu, X
Hou, F
Xu, X
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Article History
Received: 23 November 2013
Revised: 23 July 2014
Accepted: 9 September 2014
First Online: 29 October 2014
Competing interests
: The authors declare no conflict of interest.
