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Authors
Zhang, Ruo-Yang
Zhai, Yan-Wang
Lin, Shi-Rong
Zhao, Qing
Wen, Weijia
Ge, Mo-Lin
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Article History
Received: 30 March 2015
Accepted: 3 August 2015
First Online: 2 September 2015
Competing interests
: The authors declare no competing financial interests.
