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Authors
Li, Chun
Han, Xiaopeng
Cheng, Fangyi http://orcid.org/0000-0002-9400-1500
Hu, Yuxiang
Chen, Chengcheng
Chen, Jun
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Article History
Received: 10 February 2015
Accepted: 28 April 2015
First Online: 4 June 2015
Competing interests
: The authors declare no competing financial interests.
