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Authors
Li, Xing
Dai, Shenggan
Zou, Weiwen
Chen, Jianping
Nie, Qiuhua
Dai, Shixun
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Article History
Received: 21 June 2017
Accepted: 31 July 2017
First Online: 25 August 2017
Competing Interests
: The authors declare that they have no competing interests.
