1. Department of Cardiology, King's College Hospital, London SE5 9RS, UK
2. Morriston, UK Cardiac Regional Centre, Swansea Bay Health Board, Swansea SA6 6NL, UK
3. Department of Cardiology, Newham University Hospital, Barts Health NHS Trust, Glen Road, London E13 8SL, UK
4. Barts Heart Centre, Barts Health NHS Trust, West Smithfield, London EC1A 7BE, UK
5. Department of Neuroscience, Imaging and Clinical Sciences, Institute of Advanced Biomedical Technologies, G.d'Annunzio University, 66100 Chieti, Italy
6. Department of Clinical Sciences, Lund University, Jan Waldenströms gata 35-205 02, Malmö, SE-221 00, Sweden
7. Department of Cardiology, Casa di Cura Villa Serena, 65013 Città Sant'Angelo, Pescara, Italy
8. NIHR Barts Biomedical Research Centre, William Harvey Research Institute, Queen Mary University of London, London EC1A 7BE, UK