Funding for this research was provided by:
National University of Singapore Initiative to Improve Health in Asia (NIHA-2011-1-010)
Received: 19 June 2020
Accepted: 5 October 2020
First Online: 13 November 2020
Ethics approval and consent to participate
: All participants in this survey have signed consent to participate. The ethical approvals have been obtained from the University of Hong Kong (EA280812) and the National University of Singapore (NHG DSRB Ref: 2013/00047).
: All authors agreed to publish the paper in the <i>International Journal of Health Geographics</i>.
: There are no competing interests to declare.