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Authors
Wang, Fengyan
Li, Meng
Wang, Bing
Zhang, Jiangyan
Cheng, Yongqiang
Liu, Libing
Lv, Fengting
Wang, Shu
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Article History
Received: 27 October 2014
Accepted: 3 December 2014
First Online: 5 January 2015
Competing interests
: The authors declare no competing financial interests.
