Funding for this research was provided by:
Small Project Funding (201209176037)
Received: 29 May 2019
Accepted: 16 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: Ethical approval was granted by the Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (Reference number: UW13-423).
: Not applicable.
: The authors declare that they have no competing interests.