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Authors
Wang, Fang
Wang, Junyong
Guo, Shuang
Zhang, Jinzhong
Hu, Zhigao
Chu, Junhao
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Article History
Received: 11 November 2016
Accepted: 13 February 2017
First Online: 17 March 2017
Competing interests
: The authors declare no competing financial interests.
