Footnotes

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• Contributors This article was conceptualised by SM, ZA, JD, A-MS and JC. SM drafted the article. ZA, JD, A-MS and JC reviewed the article for intellectual content and edited the final version. All authors have reviewed and approved this version.

• Funding This article was conceptualised and written as part of SM's National Institute for Health Research Doctoral Research Fellowship funded by the Research Trainees Coordinating Centre (DRF-2014-07-065).

• Disclaimer The views expressed in this article are those of the authors and not necessarily those of the NHS, the National Institute of Health Research (NIHR) or the Department of Health.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.