- Received November 2, 2016.
- Revision requested November 29, 2016.
- Accepted December 23, 2016.
- Published online March 27, 2017.
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© British Journal of General Practice 2017
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- Natasha Mejzner, BSc (Hons), Honorary associate research fellow
- Christopher E Clark, PhD, FRCP, FRCGP, Clinical senior lecturer
- Lindsay FP Smith, MD, PhD, FRCP, FRCGP, Research lead
- John L Campbell, MD, FRCGP, Professor of general practice and primary care
- Address for correspondence
Christopher E Clark, Primary Care Research Group, University of Exeter Medical School, Smeall Building, St Luke’s Campus, Magdalen Rd, Exeter, Devon EX1 2LU, UK. E-mail: