1. Department of Respiratory Medicine, Parc Taulí Sabadell – University Hospital, Sabadell, Spain
2. Universitat Autònoma de Barcelona, Esfera UAB, Barcelona, Spain
3. Multidisciplinary and Multi-Institutional Research Network in Respiratory Diseases—CIBERES, Instituto de Salud Carlos III (ISCIII), Spain
4. Health Services Research on Chronic Diseases Network- REDISSEC, Spain
5. Clinical Epidemiology, Parc Taulí Sabadell – University Hospital, Sabadell, Spain
6. Obstetrics, Gynecology and Preventive Medicine Department, Universitat Autònoma de Barcelona-UAB, Bellaterra, Barcelona, Spain
7. Pulmonology Department, Hospital del Mar – IMIM. CEXS, Universitat Pompeu Fabra, Barcelona, Catalonia, Spain
8. Research Unit, Galdakao Hospital, Bilbao, Spain
9. Research Unit, Hospital Costa del Sol, Marbella, Spain
10. Pulmonology Department. Hospital, La Paz. Madrid, Spain