Funding for this research was provided by:
National Medical Research Council (NMRC/TA/0061/2017)
Received: 1 April 2020
Accepted: 10 July 2020
First Online: 6 August 2020
Ethics approval and consent to participate
: Consent from all participants were obtained and this study was carried out under the approval of the Centralised Institutional Review Board of the Singapore Health Services (CIRB Reference No. 2015/2652).
: Not applicable.
: The authors declare that they have no competing interests.