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Authors
Li, X
Gao, D
Wang, H
Li, X
Yang, J
Yan, X
Liu, Z
Ma, Z
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Article History
Received: 11 October 2014
Revised: 17 February 2015
Accepted: 20 February 2015
First Online: 2 April 2015
Competing interests
: The authors declare no conflict of interest.
