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Authors
Ren, Xifeng
Wang, Jibin
Liu, Lipan
Sun, Genlou
Li, Chengdao
Luo, Hong
Sun, Dongfa
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Article History
Received: 5 March 2016
Accepted: 26 July 2016
First Online: 17 August 2016
Competing interests
: The authors declare no competing financial interests.
