1. Department of Public Health, Policy and Systems, University of Liverpool, Liverpool, UK
2. Department of Basic and Clinical Neuroscience, King’s College London, London, UK
3. Institute of Pharmaceutical Science, King’s College London, London, UK
4. Academic Unit of Primary Medical Care, University of Sheffield, Sheffield, UK
5. School of Health and Related Research, University of Sheffield, Sheffield, UK
6. North West Ambulance Service NHS Trust, Bolton, UK
7. Centre for Health Economics and Medicines Evaluation, Bangor University, Bangor, UK
8. Department of Pharmacology and Therapeutics, University of Liverpool, Liverpool, UK