1. Emergency Medicine Registrar, Emergency Department, Cambridge University Hospitals NHS Foundation Trust, Cambridge
2. Blizard Institute, Queen Mary University of London, London
3. Email:
4. General Practice Registrar, Chesterfield and the Derbyshire Dales Training Programme, Chesterfield
5. Wingerworth Medical Centre, Allendale Road, Wingerworth, Chesterfield
6. General Practitioner, Blizard Institute, Queen Mary University of London, London
7. Chesterfield and the Derbyshire Dales Training Programme, Chesterfield
8. *These authors contributed equally to this work.