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Authors
Xu, Shan
Yang, Ya'nan
Dong, Lingling
Qiu, Wenlong
Yang, Lu
Wang, Xiuwen
Liu, Lian
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Article History
Received: 2 April 2014
Accepted: 20 June 2014
First Online: 10 July 2014
Competing interests
: The authors declare no competing financial interests.
