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Authors
Li, Yong
Yu, Gaokun
Liang, Bin
Zou, Xinye
Li, Guangyun
Cheng, Su
Cheng, Jianchun
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Article History
Received: 30 May 2014
Accepted: 3 October 2014
First Online: 30 October 2014
Competing interests
: The authors declare no competing financial interests.
