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Authors
Lu, Zhifeng
Ren, Tao
Pan, Yonghui
Li, Xiaokun
Cong, Rihuan
Lu, Jianwei
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Article History
Received: 16 September 2015
Accepted: 29 January 2016
First Online: 23 February 2016
Competing interests
: The authors declare no competing financial interests.
