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Authors
Li, Guoqi
Deng, Lei
Xu, Yi
Wen, Changyun
Wang, Wei
Pei, Jing
Shi, Luping
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Article History
Received: 27 July 2015
Accepted: 2 December 2015
First Online: 13 January 2016
Competing interests
: The authors declare no competing financial interests.
