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Authors
Wu, Dan
Liu, Xin
Wu, Di
Di, Xin
Guan, Haixia
Shan, Zhongyan
Teng, Weiping
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Article History
Received: 11 August 2014
Accepted: 22 January 2015
First Online: 23 February 2015
Competing interests
: The authors declare no competing financial interests.
