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Authors
Wang, Jixiang
Wang, Yunyun
Qiu, Hao
Sun, Lin
Dai, Xiaohui
Pan, Jianming
Yan, Yongsheng
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Article History
Received: 6 December 2016
Accepted: 22 March 2017
First Online: 9 May 2017
Competing interests
: The authors declare no competing financial interests.
