Article Text

Download PDFPDF
Authors' response

Statistics from


  • 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.

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.

Linked Articles