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Authors
Luo, Jun
Pan, Yong-Bao
Xu, Liping
Grisham, Michael Paul
Zhang, Hua
Que, Youxiong
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Article History
Received: 5 May 2015
Accepted: 2 October 2015
First Online: 26 October 2015
Competing interests
: The authors declare no competing financial interests.
