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Authors
Gao, Likun
Gan, Wentao
Qiu, Zhe
Zhan, Xianxu
Qiang, Tiangang
Li, Jian
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Article History
Received: 22 January 2017
Accepted: 28 March 2017
First Online: 24 April 2017
Competing Interests
: The authors declare that they have no competing interests.
