1. Department of Respiratory Medicine, Hospital Lucus Augusti, Lugo, Spain
2. Department of Respiratory Medicine, Complejo Hospitalario de Pontevedra, Pontevedra, Spain
3. Department of Respiratory Medicine, Hospital Clínico Universitario de Santiago, A Coruña, Spain
4. Department of Respiratory Medicine, Hospital Álvaro Cunqueiro, Vigo, Spain
5. Department of Respiratory Medicine, Hospital POVISA, Vigo, Spain
6. Department of Respiratory Medicine, Complejo Hospitalario Universitario de Ourense, Ourense, Spain
7. Department of Health Outcomes Research, Instituto Max Weber, Majadahonda, Spain