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Footnotes

  • Linked articles 198465, 222240.

  • Funding This letter reports on an independent study which is funded by the Policy Research Programme in the Department of Health. The views expressed are not necessarily those of the Department.

  • Competing interests None.

  • Ethics approval This study was conducted with the approval of the London Research Ethics Committee.

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

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