1. Department of Thoracic and Cardiovascular Surgery, West-German Heart and Vascular Center, University Hospital Essen , Essen, Germany
2. Department of Cardiac Surgery, Medical University of Innsbruck , Austria
3. Department of Clinical and Molecular Medicine, Sapienza University of Rome , Rome, Italy
4. Cardiovascular Research Center Aalst OLV Hospital , Aalst, Belgium
5. Department of Epidemiology, Harvard T.H. Chan School of Public Health , Boston, MA, USA
6. Chirurgie Cardiaque et Transplantation, Assistance Publique Hôpital Henri Mondor, Université Paris UPEC , Paris, France
7. Department of Cardiology, Innsbruck Medical University , Innsbruck, Austria
8. Department of Cardiovascular Surgery, University Heart Center Freiburg , Freiburg, Germany
9. Department of Interventional Cardiology, Jagiellonian University Medical College, Institute of Cardiology, The John Paul II Hospital , Krakow, Poland
10. Department of Biomedical Sciences for Health, University of Milan , Milan, Italy
11. Department of Cardiothoracic Surgery, Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, UK
12. National Heart and Lung Institute, Imperial College London, London, UK
13. Department of Cardiac Surgery, Medical University Vienna , Vienna, Austria
14. Clinical Department of Cardiac Surgery, Central Clinical Hospital of the Ministry of Interior and Administration, Centre for Postgraduate Medical Education , Warsaw, Poland
15. Faculty of Medicine, University Hospital Essen , Essen, Germany
16. Faculty of Medicine, Albert-Ludwigs-University Freiburg , Freiburg, Germany
17. Department and School of Cardiovascular Surgery, University of Brescia Medical School, Spedali Civili di Brescia , Brescia, Italy