1. Respiratory Department; Gregorio Marañón University Hospital; Madrid Spain
2. Faculty of Medicine, Complutense University of Madrid (UCM); Gregorio Marañón Health Research Institute (IiSGM); Madrid Spain
3. Department of Internal Medicine; Infanta Leonor University Hospital; Madrid Spain
4. Preventive Medicine and Public Health Teaching and Research Unit, Department of Health Sciences; Rey Juan Carlos University; Madrid Spain
5. Department of Internal Medicine; Germans Trias i Pujol University Hospital; Barcelona Spain
6. Respiratory Department; Ramón y Cajal Hospital, IRYCIS; Madrid Spain
7. Department of Internal Medicine; Carlos Haya Hospital; Málaga Spain