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Authors
Huang, Hua
Ng, Cheng Yang
Yu, Dejie
Zhai, Jing
Lam, Yulin
Soong, Tuck Wah
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Article History
Received: 26 February 2014
Accepted: 20 June 2014
First Online: 24 July 2014
Competing interests
: The authors declare no competing financial interests.
