1. Faculty of Medicine Valladolid University Valladolid Spain
2. Advanced Life Support, Emergency Medical Services (SACYL) Valladolid Spain
3. Emergency Department Hospital Universitario Rio Hortega Valladolid Spain
4. Data Analysis Unit, Health Research Institute Hospital de la Princesa Madrid Spain
5. CONICET Buenos Aires Argentina
6. Emergency Department Hospital Clínico Universitario Valladolid Spain
7. Facultad de Medicina Universidad Autónoma de Madrid Madrid Spain
8. Servicio de Neumología Hospital Universitario de La Princesa Madrid Spain
9. Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES) Instituto de Salud Carlos III (ISCIII) Madrid Spain