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Authors
Peng, Xuemei
Li, Haiyan
Yang, Yunfei
Zhi, Heng
Li, Chengcheng
Guo, Jian
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Article History
Received: 25 August 2016
Accepted: 1 February 2017
First Online: 6 March 2017
Competing interests
: The authors declare no competing financial interests.
