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Authors
Sun, Yan
Liu, Linwen
Feng, Jiajia
Yue, Weihua
Lu, Lin
Fan, Yong
Shi, Jie
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Article History
Received: 3 November 2016
Accepted: 22 February 2017
First Online: 27 March 2017
Competing interests
: The authors declare no competing financial interests.
