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Authors
Lu, Yu
Li, Quan
Liu, Yu-Ying
Sun, Kai
Fan, Jing-Yu
Wang, Chuan-She
Han, Jing-Yan
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Article History
Received: 2 December 2014
Accepted: 6 August 2015
First Online: 8 September 2015
Competing interests
: The authors declare no competing financial interests.
