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Authors
Wang, Yi-Xuan
Guo, Dong-Sheng
Duan, Yong-Chao
Wang, Yong-Jian
Liu, Yu
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Article History
Received: 6 January 2015
Accepted: 6 February 2015
First Online: 12 March 2015
Competing interests
: The authors declare no competing financial interests.
