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Authors
Pang, Yongqiang
Wang, Jiafu
Ma, Hua
Feng, Mingde
Li, Yongfeng
Xu, Zhuo
Xia, Song
Qu, Shaobo
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Article History
Received: 25 February 2016
Accepted: 17 June 2016
First Online: 8 July 2016
Competing interests
: The authors declare no competing financial interests.
