Funding for this research was provided by:
Social Welfare Department Fund
Article History
First Online: 29 November 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethical approval has been granted by Review Committee of the City University of Hong Kong.
: Informed consent was obtained from all individual participants included in the study.