1. Second Department of Adult Cardiac Surgery—Heart and Lung Transplantation, Onassis Cardiac Surgery Center, 176 74 Athens, Greece
2. First Department of Cardiology, National and Kapodistrian University of Athens, Hippocration General Hospital, 115 27 Athens, Greece
3. Royal Brompton and Harefield Hospitals, Guy’s and St Thomas’ NHS Foundation Trust, London 26504, UK
4. Department of Cardiology, University Hospital of Patras, 265 04 Patras, Greece