1. Cardiovascular Research and Development Unit, University of Porto and Department of Cardiothoracic Surgery, University Hospital Center of São João, Porto, Portugal
2. Department of Cardiothoracic Surgery, Maastricht University Medical Center, Maastricht, Netherlands
3. Department of Cardiac Surgery, Medical University of Innsbruck, Innsbruck, Austria
4. Department of Cardiac Surgery, Heart and Lung Center, Helsinki University Hospital, Helsinki, Finland
5. Department of Surgery, Maastricht University Medical Center, Maastricht, Netherlands
6. Department of Cardiothoracic Surgery, Royal Brompton and Harefield NHS Foundation Trust, Harefield, UK
7. Department of Cardiothoracic Surgery, Guy’s and St Thomas NHS Foundation Trust, London, UK
8. Department of Cardiothoracic Surgery, University Medical Center Utrecht, Utrecht, Netherlands
9. Department of Cardiac Surgery, Leipzig Heart Center, Leipzig, Germany
10. Department of Cardiothoracic Surgery, Leeds Teaching Hospitals Trust, Leeds, UK
11. Department of Cardiothoracic Surgery, Erasmus University Medical Center, Rotterdam, Netherlands
12. Comprehensive Clinical Trials Unit, Institute of Clinical Trials and Methodology, University College London, London, UK
13. Department of Cardiac Surgery, CHUV—Lausanne University Hospital, Lausanne, Switzerland
14. Department of Cardiac Surgery, Royal Navarre Hospital, Pamplona, Spain