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Authors
Fan, Dazhi
Wu, Song
Liu, Li
Xia, Qing
Wang, Wen
Guo, Xiaoling
Liu, Zhengping
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Article History
Received: 18 May 2016
Accepted: 5 December 2016
First Online: 9 January 2017
Competing interests
: The authors declare no competing financial interests.
