1. GKT School of Medical Education King′s College London London UK
2. Department of Cardiothoracic Surgery Liverpool Heart and Chest Hospital Liverpool UK
3. Liverpool Center for Cardiovascular Science, Liverpool Heart and Chest Hospital University of Liverpool Liverpool UK
4. Department Cardiothoracic Surgery Southampton General Hospital Southampton UK
5. Department of Interventional Radiology Southampton General Hospital Southampton UK
6. Department of Vascular Surgery Southampton General Hospital Southampton UK