1. 2nd Critical Care Department, Attikon University Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
2. Cardiac Surgery ICU, Onassis Cardiac Surgery Center, Athens, Greece
3. 4th Department of Internal Medicine, Attikon University Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
4. Department of Cardiac Surgery, Attikon University Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece