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Authors
Cao, Xiaowei
Liu, Jie
Chen, Jian
Zheng, Guo
Kuntner, Matjaž
Agnarsson, Ingi
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Article History
Received: 2 April 2016
Accepted: 25 October 2016
First Online: 19 December 2016
Competing interests
: The authors declare no competing financial interests.
