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Authors
Liu, Chengdong
Dai, Wei
Bai, Yan
Chi, Changfeng
Xin, Yi
He, Gen
Mai, Kangsen
Duan, Cunming
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Article History
Received: 24 November 2016
Accepted: 3 April 2017
First Online: 17 May 2017
Competing Interests
: The authors declare that they have no competing interests.
