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Authors
Li, Xinwei
Li, Deyu
Li, Qiongling
Li, Yuxia
Li, Kuncheng
Li, Shuyu
Han, Ying
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Article History
Received: 30 April 2015
Accepted: 11 January 2016
First Online: 15 February 2016
Competing interests
: The authors declare no competing financial interests.
