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Authors
Wang, Nan
Xu, Qun
Xu, Shanshan
Qi, Yuhang
Chen, Meng
Li, Hongxiang
Han, Buxing
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Article History
Received: 1 June 2015
Accepted: 20 October 2015
First Online: 16 November 2015
Competing interests
: The authors declare no competing financial interests.
