1. Medical Sciences Division University of Oxford Oxford UK
2. Department of Surgery and Cancer Imperial College London London UK
3. Department of Cardiothoracic Surgery Maastricht University Medical Centre Maastricht Netherlands
4. School of Medicine Lancaster University Lancaster UK
5. Department of Cardiothoracic Transplant and Vascular Surgery, Hannover Medical School Hannover Germany
6. Department of Cardiothoracic Surgery Hull University Teaching Hospitals NHS Trust Hull UK
7. Department of Cardiothoracic Surgery Royal Papworth NHS Trust Cambridge UK
8. Department of Cardiothoracic Surgery National Heart and Lung Institute, Imperial College London London UK