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Authors
Bi, Cheng
Wang, Qi
Shao, Yuchuan
Yuan, Yongbo
Xiao, Zhengguo
Huang, Jinsong
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Article History
Received: 30 January 2015
Accepted: 5 June 2015
First Online: 20 July 2015
Competing interests
: The authors declare no competing financial interests.
