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Contributors The original idea was conceived by DR and JW. JW and PAS wrote initial drafts and completed data collection. AC provided data analysis support.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests JW, AS and DR are members of the National PEWS steering committee.
Provenance and peer review Not commissioned; externally peer reviewed.