Affiliations

• ¹ Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK trish.greenhalgh@phc.ox.ac.uk.
• ² West Hertfordshire Hospitals NHS Trust, Hertfordshire, UK.
• ³ West Hertfordshire Respiratory Service-Central London Community Healthcare, Hertfordshire, UK.
• ⁴ Hampshire Hospitals NHS Foundation Trust, Hampshire, UK.
• ⁵ NHS England, London, UK.
• ⁶ Department of Applied Health Research, University College London, London, UK.
• ⁷ Royal College of General Practitioners, London, UK.