1. Cardiology Department, Liverpool University Hospitals NHS Foundation Trust, Liverpool, United Kingdom
2. General Medicine, The Dudley Group NHS Foundation Trust Dudley, Dudley, United Kingdom
3. Cedar House, University of Liverpool, Liverpool, United Kingdom
4. General Medicine, Southport and Ormskirk Hospital NHS Trust, Southport, United Kingdom
5. Cardiology Department, Liverpool Heart & Chest Hospital NHS Trust, Liverpool, United Kingdom
6. Cardiology Department, Liverpool John Moores University, Liverpool, United Kingdom