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Authors
Mai, Zhen-Peng
Ni, Gang
Liu, Yan-Fei
Li, Li
Shi, Guo-Ru
Wang, Xin
Li, Jia-Yuan
Yu, De-Quan
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Article History
Received: 8 March 2017
Accepted: 12 May 2017
First Online: 7 July 2017
Competing Interests
: The authors declare that they have no competing interests.
