1. Division of Cardiac Surgery, CHUV—Lausanne University Hospital , Lausanne, Switzerland
2. Department of Cardiovascular Surgery, La Tour Hospital , Geneva, Switzerland
3. Department of Cardiovascular Surgery, Heart Centre Freiburg University , Freiburg, Germany
4. Department of Cardiac Surgery, Complejo Hospitalario de Navarra , Pamplona, Spain
5. Department of Cardiac Surgery and Cardiovascular Research, Dedinje Cardiovascular Institute , Belgrade, Serbia
6. Department of Cardiothoracic Surgery, Erasmus University Medical Center , Rotterdam, Netherlands