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Authors
Tan, Yanli
Gao, Qiuming
Yang, Chunxiao
Yang, Kai
Tian, Weiqian
Zhu, Lihua
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Article History
Received: 23 February 2015
Accepted: 16 June 2015
First Online: 23 July 2015
Competing interests
: The authors declare no competing financial interests.
