Funding for this research was provided by:
University Research Committee, University of Hong Kong
Received: 27 February 2020
Accepted: 20 July 2020
First Online: 30 July 2020
Ethics approval and consent to participate
: This study was approved by Institutional Review Board of The University of Hong Kong/Hospital Authority Hong Kong West Cluster (UW 16–2077). Written consent was obtained from each participating doctor.
: Not applicable.
: The authors declare that they have no competing interests.