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Contributors All authors contributed significantly to the concept, design and writing of the manuscript and agreed to be accountable for the content of the manuscript, had authority over manuscript preparation and the decision to submit to BMJ Quality and Safety. The authors agree to adhere to all terms of BMJ Quality and Safety, including terms for copyright.
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 None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.