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Authors
Shen, Ya-Xi
Peng, Yu-Gui
Chen, Xin-Cheng
Zhao, De-Gang
Zhu, Xue-Feng
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Article History
Received: 19 January 2017
Accepted: 27 February 2017
First Online: 28 March 2017
Competing interests
: The authors declare no competing financial interests.
