1. Pulmonary Department, Hospital Álvaro Cunqueiro, Vigo, Spain.
2. PneumoVigoI+I Research Group, Sanitary Research Institute Galicia Sur (IIS Galicia Sur), Vigo, Spain.
3. Deparment of Preventive Medicine and Public Health, University of Santiago de Compostela, Santiago de Compostela, Spain.
4. Consortium for Biomedical Research in Epidemiologic and Public Health (CIBER en Epidemiologia y Salúd Pública—CIBERESP), Madrid, Spain.