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Authors
Gao, Ya
Hu, Jia-Mian
Nelson, C. T.
Yang, T. N.
Shen, Y.
Chen, L. Q.
Ramesh, R.
Nan, C. W.
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Article History
Received: 6 January 2016
Accepted: 8 March 2016
First Online: 31 March 2016
Competing interests
: The authors declare no competing financial interests.
