1. Department of Respiratory Medicine, Glenfield Hospital, University Hospitals of Leicester, Groby Road, Leicester LE3 9QP, UK
2. Second Department of Critical Care Medicine, Attikon University Hospital, University of Athens, Medical School, 1 Rimini Street, Haidari, 12462 Athens, Greece
3. Second Department of Cardiology, Attikon University Hospital, University of Athens, Medical School, 1 Rimini Street, Haidari, 12462 Athens, Greece
4. Laboratory of Haematology and Blood Bank Unit, Attikon University Hospital, University of Athens, Medical School, 1 Rimini Street, Haidari, 12462 Athens, Greece