1. Department of Cardiology, Liverpool Heart and Chest Hospital, Liverpool, UK
2. Department of Cardiothoracic Surgery, Liverpool Heart and Chest Hospital, UK
3. Department of Cardiology, Royal Papworth Hospital, Cambridge, UK
4. Department of Radiology, Royal Papworth Hospital, Cambridge, UK; Division of Cardiovascular Medicine, University of Cambridge, Cambridge, UK
5. Department of Cardiology, Royal Papworth Hospital, Cambridge, UK; Division of Cardiovascular Medicine, University of Cambridge, Cambridge, UK
6. Department of Cardiology, Liverpool Heart and Chest Hospital, Liverpool, UK; Liverpool Centre for Cardiovascular Science, University of Liverpool, Liverpool, UK