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Authors
Bao, Dan
Ma, Yuanwu
Zhang, Xu
Guan, Feifei
Chen, Wei
Gao, Kai
Qin, Chuan
Zhang, Lianfeng
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Article History
Received: 27 February 2015
Accepted: 29 September 2015
First Online: 5 November 2015
Competing interests
: The authors declare no competing financial interests.
