Funding for this research was provided by:
Hong Kong Research Grant Council (CityU11205917)
City University of Hong Kong (7005226)
Article History
First Online: 23 July 2020
Compliance with Ethical Standards
: Ethics approval for the study protocol was obtained from the Research Ethics Committee of City University of Hong Kong (Reference No. 2011SRG100).
: The authors declare that they have no conflict of interest.