Funding for this research was provided by:
Health Services Research Competitive Research Grant, National Medical Research Council, Singapore
Text and Data Mining valid from 2019-11-04
Received: 7 April 2019
Accepted: 22 October 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: Ethics approval was taken from the National University of Singapore Institutional Review Board, SingHealth Centralized Institutional Review Board and the National Health Group Domain Specific Review Board. Written informed consent was taken from all participants in S3.
: Not applicable.
: The authors declare that they have no competing interests.