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Authors
Yin, Jun
Zhang, Zhuhua
Li, Xuemei
Yu, Jin
Zhou, Jianxin
Chen, Yaqing
Guo, Wanlin
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Article History
Received: 1 October 2012
Accepted: 7 March 2014
First Online: 6 May 2014
Competing interests
: The authors declare no competing financial interests.
