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Authors
Sha, Z. D.
Quek, S. S.
Pei, Q. X.
Liu, Z. S.
Wang, T. J.
Shenoy, V. B.
Zhang, Y. W.
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Article History
Received: 27 December 2013
Accepted: 25 July 2014
First Online: 8 August 2014
Competing interests
: The authors declare no competing financial interests.
