1. Intensive Care Unit; 1st Department of Respiratory Medicine; Sotiria Hospital; National and Kapodistrian University of Athens; Athens Greece
2. Haematology Laboratory-Blood Bank; Aretaieion Hospital; National and Kapodistrian University of Athens; Athens Greece
3. Cardiothoracic Intensive Care Unit; Onasseio Cardiac Surgery Center; Athens Greece
4. First Department of Internal Medicine; Agios Savvas Regional Cancer Hospital; Athens Greece
5. Therapeutics Clinic; National and Kapodistrian University of Athens, Alexandra Hospital; Athens Greece