1. Chest Diseases Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt
2. Department of Respiratory Medicine, Hospital Universitario Son Espases-IdISBa, Palma, Spain
3. Cardiology Department, Hospital Universitario Son Espases-IdISBa, Palma, Spain
4. Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
5. CIBERES, Instituto de Salud Carlos III, Madrid, Spain