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Contributors JY and FMR developed the manuscript. All authors reviewed the manuscript and provided critical inputs.
Funding This study was funded by the Health Promotion Board, Singapore, and the National University Health System, Singapore.
Competing interests FMR and CST received funding from the Health Promotion Board, Singapore. NL and JT are employed by the Health Promotion Board, Singapore.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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