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Authors
Yang, Shaoxiang
Tian, Hongyu
Sun, Baoguo
Liu, Yongguo
Hao, Yanfeng
Lv, Yanyu
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Article History
Received: 5 April 2016
Accepted: 11 August 2016
First Online: 1 September 2016
Competing interests
: The authors declare no competing financial interests.
