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Authors
Li, Xingxing
Zhang, Xiaohong
Ren, Xiaodong
Fritsche, Mathias
Wickert, Jens
Schuh, Harald
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Article History
Received: 30 September 2014
Accepted: 15 January 2015
First Online: 9 February 2015
Competing interests
: The authors declare no competing financial interests.
