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Authors
Ma, Yi
Zhao, Shaojun
Shen, Shutao
Fang, Shixiong
Ye, Zulu
Shi, Zhi
Hong, An
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Article History
Received: 2 December 2014
Accepted: 31 July 2015
First Online: 4 September 2015
Competing interests
: The authors declare no competing financial interests.
