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Authors
Li, Hongqiang
Zhou, Wenqian
Liu, Yu
Dong, Xiaye
Zhang, Cheng
Miao, Changyun
Zhang, Meiling
Li, Enbang
Tang, Chunxiao
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Article History
Received: 5 November 2013
Accepted: 14 April 2014
First Online: 6 May 2014
Competing interests
: The authors declare no competing financial interests.
