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Authors
Xiang, Zhonghua
Wang, Dan
Xue, Yuhua
Dai, Liming
Chen, Jian-Feng
Cao, Dapeng
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Article History
Received: 25 September 2014
Accepted: 22 December 2014
First Online: 5 June 2015
Competing interests
: The authors declare no competing financial interests.
