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Authors
Yang, Lixian
Wang, Hanying
Shen, Qi
Feng, Lifeng
Jin, Hongchuan
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Article History
Received: 21 March 2017
Revised: 14 August 2017
Accepted: 17 August 2017
First Online: 5 October 2017
Competing interests
: The authors declare no conflict of interest.
