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Authors
Xing, P.
Chen, G. F. R.
Zhao, X.
Ng, D. K. T.
Tan, M. C.
Tan, D. T. H.
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Article History
Received: 5 January 2017
Accepted: 28 July 2017
First Online: 22 August 2017
Competing Interests
: The authors declare that they have no competing interests.
