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Authors
Peng, Zhikun
Liu, Xu
Li, Shuaihui
Li, Zhongjun
Li, Baojun
Liu, Zhongyi
Liu, Shouchang
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Article History
Received: 2 June 2016
Accepted: 28 November 2016
First Online: 6 January 2017
Competing interests
: The authors declare no competing financial interests.
