1. Department of Adult Cardiac Surgery, G Pasquinucci Heart Hospital , Massa, Italy
2. Cardiothoracic Surgery, King's College Hospital NHS Foundation Trust , London, UK
3. Department of Cardiac Surgery, Città di Lecce Hospital, GVM Care & Research , Lecce, Italy
4. Cardiothoracic Surgery, The Royal Melbourne Hospital , Parkville, VIC, Australia
5. Department of Cardiothoracic Surgery, University of Magdeburg , Magdeburg, Germany
6. Department of Cardiovascular Surgery, Poliambulanza Foundation/Cardiac Surgery Unit , Brescia, Italy
7. Department of Cardiac Surgery, Gruppo San Donato , Milano, Italy