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Authors
Ng, Siu-Kin
Hu, Taobo
Long, Xi
Chan, Cheuk-Hin
Tsang, Shui-Ying
Xue, Hong
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Article History
Received: 26 June 2015
Accepted: 7 January 2016
First Online: 8 February 2016
Competing interests
: The authors declare no competing financial interests.
