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Authors
Zhao, Sipei
Hu, Yuxiang
Lu, Jing
Qiu, Xiaojun
Cheng, Jianchun
Burnett, Ian
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Article History
Received: 5 August 2014
Accepted: 29 September 2014
First Online: 15 October 2014
Competing interests
: The authors declare no competing financial interests.
