1. Department of Preventive Medicine University of Santiago de Compostela Santiago de Compostela Spain
2. Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBER‐ESP) Madrid Spain
3. Health Research Institute of Santiago de Compostela (IDIS) Santiago de Compostela Spain
4. Methodology and Statistics Unit Galicia Sur Health Research Institute (IISGS) Vigo Spain
5. Department of Medicine University of Santiago de Compostela Santiago de Compostela Spain
6. Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER‐ES) Madrid Spain
7. Department of Respiratory Medicine University Hospital of Santiago de Compostela (CHUS) Santiago de Compostela Spain