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Authors
Zhou, Ling
Jiang, Lifeng
Xu, Maolei
Liu, Qun
Gao, Ning
Li, Ping
Liu, E-Hu
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Article History
Received: 28 August 2015
Accepted: 7 January 2016
First Online: 5 February 2016
Competing interests
: The authors declare no competing financial interests.
