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Authors
Gu, Pengfei
Yang, Fan
Su, Tianyuan
Wang, Qian
Liang, Quanfeng
Qi, Qingsheng
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Article History
Received: 18 November 2014
Accepted: 16 March 2015
First Online: 8 April 2015
Competing interests
: The authors declare no competing financial interests.
