Acknowledgements We thank Fiona Stewart for help with designing the search strategy, Rumana Newlands for help with title and abstract screening and Nicola McCleary and Karen Allan for help with data extraction. The authors would also like to thank Alexandra Barratt, Jennifer Hewitt and Susan Racette for providing us with previously unpublished data. This work was funded through a Medical Research Council doctoral training award. The Health Services Research Unit is funded by the Chief Scientist Office of the Scottish Government Health and Social Care Directorates. The views expressed are those of the authors alone.
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