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Authors
Liu, Yamei
Ma, Kai
Jiao, Tifeng
Xing, Ruirui
Shen, Guizhi
Yan, Xuehai
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Article History
Received: 28 October 2016
Accepted: 17 January 2017
First Online: 23 February 2017
Competing interests
: The authors declare no competing financial interests.
