Received: 25 October 2020
Accepted: 7 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This study was approved by The Joint Chinese University of Hong Kong–New Territories East Cluster Clinical Research Ethics Committee (2020.078), The Hong Kong East Cluster Research Ethics Committee (HKECREC-2020-030), The Institutional Review Board of The University of Hong Kong/Hospital Authority Hong Kong West Cluster (UW20-288), The Research Ethics Committee of Kowloon Central/Kowloon East (KC/KE-20-007/ER-1), The Kowloon West Cluster Research Ethics Committee (KW/EX-20-077(148-01)) and New Territories West Cluster Research Ethics Committee (NTWC/REC/20058). Each ethics committee granted waiver of informed consent.
: Not applicable.
: The authors declare that they have no competing interests.