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Authors
Wu, Chuang
Hou, Nan
Piao, Xianyu
Liu, Shuai
Cai, Pengfei
Xiao, Yan
Chen, Qijun
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Article History
Received: 10 March 2015
Accepted: 27 July 2015
First Online: 24 August 2015
Competing interests
: The authors declare no competing financial interests.
