Funding for this research was provided by:
Health and Medical Research Fund (15161021)
Received: 28 November 2019
Accepted: 11 January 2020
First Online: 30 January 2020
Ethics approval and consent to participate
: Central ethical approval has been obtained from the Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (UW 17-308). We will not begin recruiting at other centers in the trial until local ethical approval has been obtained. Informed consent will be obtained from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.