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Authors
Li, S.
Kang, N.
Fan, D. X.
Wang, L. B.
Huang, Y. Q.
Caroff, P.
Xu, H. Q.
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Article History
Received: 5 January 2016
Accepted: 6 April 2016
First Online: 22 April 2016
Competing interests
: The authors declare no competing financial interests.
