Received: 29 June 2020
Accepted: 3 December 2020
First Online: 10 December 2020
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of the University of Hong Kong / Hospital Authority Hong Kong West Cluster (reference number UW 18–263) and local ethics committees. It was conducted in accordance with the Declaration of Helsinki and the guidance of Good Clinical Practice, November 30, 2006.
: Not applicable.
: The authors declare no conflict of interest.