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Authors
Wang, Shudong
Wang, Yonggang
Zhang, Zhiguo
Liu, Quan
Gu, Junlian
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Article History
Received: 31 March 2017
Revised: 11 July 2017
Accepted: 12 July 2017
First Online: 24 August 2017
Competing interests
: The authors declare no conflict of interest.
