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Authors
Zhang, Lei
Han, Hui
Ge, Min
Du, Haifeng
Jin, Chiming
Wei, Wensen
Fan, Jiyu
Zhang, Changjin
Pi, Li
Zhang, Yuheng
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Article History
Received: 2 December 2015
Accepted: 11 February 2016
First Online: 29 February 2016
Competing interests
: The authors declare no competing financial interests.
