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Authors
Nie, C
Luo, Y
Zhao, X
Luo, N
Tong, A
Liu, X
Yuan, Z
Wang, C
Wei, Y
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Article History
Received: 24 April 2014
Revised: 17 September 2014
Accepted: 18 September 2014
First Online: 30 October 2014
Competing interests
: The authors declare no conflict of interest.
