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Authors
Feng, Hailiang
Liu, Yanyan
Bian, Xiaocui
Zhou, Fangying
Liu, Yuqin
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Article History
Received: 28 March 2017
Revised: 12 September 2017
Accepted: 18 September 2017
First Online: 12 December 2017
Change Date: 23 January 2018
Change Type: Update
Change Details: This paper was modified 12 months after initial publication to switch to Creative Commons licence terms, as noted at publication
Competing interests
: The authors declare no conflict of interest.
