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Authors
Yang, Chunhui
Guo, Nining
Liu, Jinhua
Yang, Juhao
Zhu, Kai
Xiao, Hui
Leng, Qibin
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Article History
Received: 16 January 2015
Accepted: 7 May 2015
First Online: 7 August 2015
Competing interests
: The authors declare no competing financial interests.
