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Authors
Xu, Can
Sun, Yuting
Gao, Jian
Qiu, Tian
Zheng, Zhigang
Guan, Shuguang
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Article History
Received: 17 November 2015
Accepted: 2 February 2016
First Online: 23 February 2016
Competing interests
: The authors declare no competing financial interests.
