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Authors
Liu, Zhiguang
Liu, Zhe
Li, Jiafang
Li, Wuxia
Li, Junjie
Gu, Changzhi
Li, Zhi-Yuan
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Article History
Received: 8 April 2016
Accepted: 20 May 2016
First Online: 14 June 2016
Competing interests
: The authors declare no competing financial interests.
