1. Department of Haematology and Bone Marrow Transplantation, National and Kapodistrian University of Athens, Laikon General Hospital, Athens,Greece
2. General Hospital of Nikaia, Piraeus, Athens,Greece
3. Oxford Heart Centre, NIHR Biomedical Research Centre, Oxford University Hospitals, Oxford,United Kingdom
4. First Department of Cardiology, Hippokration Hospital, Medical School, National and Kapodistrian University of Athens, Athens,Greece