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Authors
Ma, Yi
Yang, Hao-Zheng
Xu, Long-Mei
Huang, Yi-Ran
Dai, Hui-Li
Kang, Xiao-Nan
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Article History
Received: 13 November 2014
Accepted: 10 February 2015
First Online: 9 March 2015
Competing interests
: The authors declare no competing financial interests.
