Funding for this research was provided by:
National University Health Systems Pte Ltd (SBRO14/NS01G)
National University of Singapore Start-up Grant (WBS: R-608-000-059-133)
Text and Data Mining valid from 2018-12-01
Received: 22 March 2017
Accepted: 5 November 2018
First Online: 18 December 2018
Ethics approval and consent to participate
: The study was exempted from full Institutional Review Board review by the National University of Singapore Institutional Review Board because it involved use of existing data that is publicly available.
: Not applicable.
: The authors declare that they have no competing interests.
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