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Authors
Niu, Fujun
Cheng, Guodong
Niu, Yonghong
Zhang, Mingyi
Luo, Jing
Lin, Zhanju
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Article History
Received: 18 May 2016
Accepted: 9 September 2016
First Online: 29 September 2016
Competing interests
: The authors declare no competing financial interests.
