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Authors
Wang, Yaping
Wu, Peng
Lin, Rufeng
Rong, Liucheng
Xue, Yao
Fang, Yongjun
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Article History
Received: 24 March 2015
Accepted: 4 August 2015
First Online: 2 September 2015
Competing interests
: The authors declare no competing financial interests.
