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Authors
Huo, Yayun
Shen, Jianguo
Wu, Huanian
Zhang, Chao
Guo, Lihua
Yang, Jinguang
Li, Weimin
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Article History
Received: 1 March 2016
Accepted: 15 April 2016
First Online: 6 May 2016
Competing interests
: The authors declare no competing financial interests.
