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Authors
Wang, H
Liu, J
Zhao, H
Zhao, X
Li, L
Shi, H
Zhan, S
Liu, J
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Article History
Received: 15 January 2014
Revised: 26 March 2014
Accepted: 2 April 2014
First Online: 15 May 2014
Competing interests
: The authors declare no conflicts of interest.
