Funding for this research was provided by:
Research Grants Council, University Grants Committee (HKU782213M)
Received: 25 March 2020
Accepted: 29 September 2020
First Online: 16 October 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the five ethics review boards in Hong Kong: Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (HKU/HA HKW IRB, Ref: UW 13–163), Hong Kong East Cluster (HA HKE IRB, Ref: HKEC-2014-087), Kowloon Central & East Cluster (HA KC/KE IRB, Ref: KC/KE-14-0093/FR-2), Kowloon West Cluster (HA KW IRB, Ref: KW/EX-14-177(79–15), as well as ethic review board from Department of Health (Ref: L/M 304/2014). Informed written consent was obtained from all participants.
: Not Applicable.
: The authors declare that they have no competing interests in this study. No financial or non-financial interests influenced the interpretation of the data or presentation of the information.