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Authors
Dong, Lingqing
Luo, Qi
Cheng, Kui
Shi, Hui
Wang, Qi
Weng, Wenjian
Han, Wei-Qiang
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Article History
Received: 11 February 2014
Accepted: 7 May 2014
First Online: 28 May 2014
Competing interests
: The authors declare no competing financial interests.
