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Authors
Ma, D
Fang, Q
Wang, P
Gao, R
Sun, J
Li, Y
Hu, X Y
Wang, J S
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Article History
Received: 14 April 2014
Revised: 8 November 2014
Accepted: 16 December 2014
First Online: 5 February 2015
Competing interests
: The authors declare no conflict of interest.
