1. Department of Cardiology, University Hospital of Larissa, 41110 Larissa, Greece
2. Division of Cardiovascular Medicine, Section of Heart Failure and Transplantation, University of Iowa, Iowa City, IA 52242, USA
3. Department of Cardiothoracic Surgery, University of Thessaly, 41110 Larissa, Greece
4. Department of Surgery and Cancer, Imperial College London, St Mary’s Hospital, London W2 1NY, UK
5. Department of Hematology, University Hospital of Larissa, University of Thessaly Medical School, 41110 Larissa, Greece