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Contributors JPS and UM wrote the first draft. All authors subsequently refined the manuscript and approved the final version. RJMcM is the guarantor.
Competing interests JPS holds a Medical Research Council Strategic Skills postdoctoral fellowship. RJMcM holds an National Institute for Health Research (NIHR) Professorship and leads the self-management theme of the NIHR Oxford Collaborations for Leadership in Applied Health Research and Care (CLAHRC).
Provenance and peer review Commissioned; externally peer reviewed.
Correction notice This paper has been amended since it was published Online First. Owing to a scripting error, some of the publisher names in the references were replaced with 'BMJ Publishing Group'. This only affected the full text version, not the PDF. We have since corrected these errors and the correct publishers have been inserted into the references.