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Authors
He, Yuxin
Zhao, Cheng
Song, Mu
Liu, Weiguo
Chen, Fahu
Zhang, Dian
Liu, Zhonghui
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Article History
Received: 13 August 2015
Accepted: 26 October 2015
First Online: 26 November 2015
Competing interests
: The authors declare no competing financial interests.
