1. Cardiology DepartmentAHEPA University HospitalAristotle University of ThessalonikiThessalonikiGreece
2. Cardiology DepartmentMediterraneo HospitalAthensGreece
3. Multidisciplinary Pulmonary Hypertension CenterAttikon University General HospitalNational and Kapodistrian University of Athens Medical SchoolAthensGreece
4. Cardiology‐Pediatric Cardiology DepartmentOnassis Cardiac Surgery CenterAthensGreece
5. Cardiology DepartmentHippokration General HospitalAthensGreece
6. Department of Thoracic MedicineUniversity Hospital of HeraklionHeraklionGreece
7. 2nd Department of CardiologyUniversity of Ioannina Medical SchoolUniversity Hospital of IoanninaIoanninaGreece
8. Respiratory Failure Unit“G. Papanikolaou” HospitalThessalonikiGreece
9. Cardiology DepartmentDemocritus University of ThraceAlexandroupolisGreece