Unfortunately, the original version of this article [1] did not include an acknowledgements section for the funding information. The Acknowledgements have been included in full in this erratum.
Acknowledgements
This project was funded by the National Institute for Health Research Health Services Research and Delivery Programme (project number 09/1801/1054). The views and opinions expressed therein are those of the authors and do not necessarily reflect those of the NIHR Health Services and Delivery Research Programme, NIHR, NHS or the Department of Health.
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