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Contributors KW conceived and wrote the entire piece and is responsible for the content.
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 KW works for BMJ, which produces e-learning resources for healthcare professionals (such as BMJ Learning).
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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