Cao, Qianlin
Liu, Wei
Wang, Jingdong
Cao, Jianping
Yang, Hongying
Article History
Received: 27 March 2017
Accepted: 20 October 2017
First Online: 10 November 2017
Compliance with ethical standards
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: The authors declare no conflicts of interests. The authors are responsible for the content and writing of this paper.