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Authors
Yang, Shuang
Wang, Yun http://orcid.org/0000-0001-8619-0455
Liu, Porun
Cheng, Yi-Bing
Zhao, Hui Jun
Yang, Hua Gui
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Article History
Received: 15 August 2015
Accepted: 1 November 2015
First Online: 18 January 2016
Competing interests
: The authors declare no competing financial interests.
