1. Pneumology and Thoracic Surgery Service, University Hospital Nuestra Señora de la Candelaria (HUNSC), Santa Cruz de Tenerife, Spain;
2. Division of Clinical Epidemiology and Biostatistics, Research Unit, University Hospital Nuestra Señora de la Candelaria (HUNSC) and Primary Care Management, Santa Cruz de Tenerife, Spain;
3. Clinical Analysis Service, University Hospital Nuestra Señora de la Candelaria (HUNSC), Santa Cruz de Tenerife, España;
4. Networked Biomedical Research Centre (CIBER) of Respiratory Diseases, Carlos III Health Institute, Madrid, Spai'n