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Authors
Xia, Tian
Liao, Qi
Jiang, Xiaoming
Shao, Yongfu
Xiao, Bingxiu
Xi, Yang
Guo, Junming
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Article History
Received: 7 May 2014
Accepted: 30 July 2014
First Online: 15 August 2014
Competing interests
: The authors declare no competing financial interests.
