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Authors
Niu, Simiao https://orcid.org/0000-0003-1973-2204
Wang, Xiaofeng
Yi, Fang
Zhou, Yu Sheng
Wang, Zhong Lin
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Article History
Received: 19 August 2015
Accepted: 19 October 2015
First Online: 11 December 2015
Competing interests
: The authors declare no competing financial interests.
