1. Division of Cardiac Surgery A, Henry Dunant Hospital , Athens, Greece
2. Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School , Hannover, Germany
3. Department of Cardiothoracic Surgery, Weill Cornell Medicine , New York, NY, USA
4. Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Centre (MUMC) , Maastricht, Netherlands
5. Department of Surgical, Oncologic and Stomatological Disciplines, University of Palermo, GVM Care & Research, Maria Eleonora Hospital , Palermo, Italy
6. Christian Barnard Department of Cardiothoracic Surgery, Groote Schuur Hospital, University of Cape Town , Cape Town, South Africa