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Authors
Li, Lu
Zeng, Zhutian
Qi, Ziping
Wang, Xin
Gao, Xiang
Wei, Haiming
Sun, Rui
Tian, Zhigang
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Article History
Received: 11 January 2015
Accepted: 3 August 2015
First Online: 8 September 2015
Competing interests
: The authors declare no competing financial interests.
