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Authors
Xie, Yun
Cao, Hai-Yuan
Zhou, Yang
Chen, Shiyou
Xiang, Hongjun
Gong, Xin-Gao
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Article History
Received: 20 January 2015
Accepted: 25 March 2015
First Online: 12 June 2015
Competing interests
: The authors declare no competing financial interests.
