1. Department of Pulmonology, University Clinical Hospital of Santiago de Compostela, Spain
2. Department of Clinical Epidemiology, University Clinical Hospital of Santiago de Compostela, Spain
3. Interdisciplinary Group of research in Pulmonology, Institute of Sanitary research from Compostela, Spain
4. University Clinical Hospital of Santiago de Compostela, Spain
5. Department of Human Resources and General Services, University Clinical Hospital of Santiago de Compostela, Spain
6. Research Methods Group, Health Research Institute of Santiago de Compostela, Spain
7. ISCIII Support Platforms for Clinical Research, Health Research Institute of Santiago de Compostela, Spain
8. Mathematics University of Santiago de Compostela, Spain
9. Medicine University of Santiago de Compostela, Spain