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Authors
Shang, Jifang
Sun, Jun
Li, Qinglian
Yang, Jinfeng
Zhang, Ling
Xu, Jingjun
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Article History
Received: 4 January 2017
Accepted: 23 May 2017
First Online: 5 July 2017
Competing Interests
: The authors declare that they have no competing interests.
