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Authors
Zhang, Yunfei
Liu, Zonglun
Yang, Kui
Zhang, Yi
Xu, Yongqian
Li, Hongjuan
Wang, Chaoxia
Lu, Aiping
Sun, Shiguo
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Article History
Received: 29 October 2014
Accepted: 9 January 2015
First Online: 2 February 2015
Competing interests
: The authors declare no competing financial interests.
