- Received April 26, 2016.
- Revision requested July 25, 2016.
- Accepted August 25, 2016.
- Published online February 23, 2017.
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© British Journal of General Practice 2017 This is an OpenAccess article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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- Juliet A Usher-Smith, PhD, MRCGP, NIHR clinical lecturer
- Barbora Silarova, PhD, Career development fellow
- Alison Ward, MSc, Researcher
- Jane Youell, PhD, Researcher
- Kenneth R Muir, PhD, Professor of epidemiology
- Jackie Campbell, PhD, Professor of neurophysiology