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Authors
Yang, Xiaoyun
Li, Yanhua
Gao, Zengqiang
Li, Zongqiang
Xu, Jianhua
Wang, Wenjia
Dong, Yuhui
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Article History
Received: 31 March 2017
Accepted: 13 July 2017
First Online: 15 August 2017
Competing Interests
: The authors declare that they have no competing interests.
