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Authors
Guo, W
Zhang, Y
Ling, Z
Liu, X
Zhao, X
Yuan, Z
Nie, C
Wei, Y
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Article History
Received: 29 April 2015
Revised: 21 July 2015
Accepted: 28 August 2015
First Online: 15 October 2015
Competing interests
: The authors declare no conflict of interest.
