1. Cardiology Department, Royal Brompton Hospital, London, UK
2. Department of Acute Internal Medicine, Northumbria Healthcare NHS Foundation Trust, Northumbria Specialist Emergency Care Hospital, Cramlington, UK
3. Department of Cardiology, Pinderfields General Hospital, The Mid Yorkshire Hospitals NHS Trust, Wakefield, UK
4. Department of Cardiology, Northern General Hospital, Sheffield, UK
5. Department of Cardiology, University of East Anglia, Norwich, UK
6. Department of Cardiology, Norfolk and Norwich University Hospitals, Norwich, UK
7. Department of Cardiology, Northumbria Healthcare NHS Foundation Trust, Northumbria Specialist Emergency Care Hospital, Cramlington, UK