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Authors
Li, Xiaojin
Guo, Hua
Yang, Yanlian
Meng, Jie
Liu, Jian
Wang, Chen
Xu, Haiyan
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Article History
Received: 5 June 2014
Accepted: 18 September 2014
First Online: 14 October 2014
Competing interests
: The authors declare no competing financial interests.
