Erratum
Unfortunately, the original version of this article [1] mistakenly did not include an Acknowledgements section. The Acknowledgements have been included in full in this erratum.
Acknowledgements
This paper presents independent research part-funded by the National Institute for Health Research School for Primary Care Research (NIHR SPCR). The views expressed are those of the author(s) and not necessarily those of the NIHR, the NHS or the Department of Health.
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