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Authors
Chen, Wei
Gao, Rong
Xie, Xinni
Zheng, Zhibing
Li, Haijing
Li, Song
Dong, Fangting
Wang, Lili
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Article History
Received: 23 December 2014
Accepted: 24 March 2015
First Online: 6 May 2015
Competing interests
: The authors declare no competing financial interests.
