Funding for this research was provided by:
Hong Kong University Grants Committee (HKBU4/T&L/12-15)
Hong Kong Baptist University (HKBU4/T&L/12-15)
Article History
Received: 31 May 2018
Accepted: 15 November 2018
First Online: 17 December 2018
Competing interests
: The authors declare that they have no competing interests.
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