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Authors
Chen, Hongyi
Ren, Juanjuan
Gu, Ying
Zhao, Dongxing
Zhang, Junxiang
Gong, Qihuang
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Article History
Received: 18 August 2015
Accepted: 16 November 2015
First Online: 16 December 2015
Competing interests
: The authors declare no competing financial interests.
