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Authors
Li, Y.
Zhang, H. R.
Lei, Y.
Chen, Y. Z.
Pryds, N.
Shen, Baogen
Sun, Jirong
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Article History
Received: 26 October 2015
Accepted: 15 February 2016
First Online: 1 March 2016
Competing interests
: The authors declare no competing financial interests.
