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Authors
Cai, Mingyang
Gao, Fan
Zhang, Peilin
An, Woojin
Shi, Jiandang
Wang, Kai
Lu, Wange
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Article History
Received: 3 June 2015
Accepted: 27 August 2015
First Online: 5 October 2015
Competing interests
: The authors declare no competing financial interests.
