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Authors
Lei, Yanyu
Jiang, Wanrun
Dai, Xing
Song, Ruixia
Wang, Bo
Gao, Yang
Wang, Zhigang
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Article History
Received: 2 February 2015
Accepted: 12 May 2015
First Online: 16 June 2015
Competing interests
: The authors declare no competing financial interests.
