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Authors
Sun, Xianjun
Hu, Zheng
Chen, Rui
Jiang, Qiyang
Song, Guohua
Zhang, Hui
Xi, Yajun
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Article History
Received: 15 December 2014
Accepted: 10 April 2015
First Online: 29 May 2015
Competing interests
: The authors declare no competing financial interests.
