1. 2nd Department of Critical Care and Pulmonary Hypertension ClinicNational & Kapodistrian University of AthensAttikon HospitalAthensGreece
2. Noninvasive Department of CardiologyOnassis Cardiac Surgery CenterAthensGreece
3. Interventional Department of CardiologyOnassis Cardiac Surgery CenterAthensGreece
4. 1st Department of Critical Care Medicine & Pulmonary ServicesNational and Kapodistrian University of AthensEvangelismos HospitalAthensGreece