1. Pneumology Department Hospital General Universitario Gregorio MarañónUniversidad Complutense de MadridCIBER de Enfermedades Respiratorias (CIBERES) Madrid Spain
2. Department of Public Health & Maternal and Child Health, Faculty of Medicine Universidad Complutense de Madrid Madrid Spain
3. Preventive Medicine and Public Health Teaching and Research Unit Department of Medical Specialties and Public Health Universidad Rey Juan Carlos Madrid Spain
4. Respiratory Department Ramón y Cajal Hospital and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS) Medicine Department Universidad de AlcaláCIBER de Enfermedades Respiratorias (CIBERES) Madrid Spain
5. Department of Internal Medicine Hospital Universitari Germans Trias i PujolCIBER de Enfermedades Respiratorias (CIBERES) Barcelona Spain
6. Faculty of Nursing, Physiotherapy and Podology Universidad Complutense de Madrid Madrid Spain