University of Valladolid - Emergency Department, University of Valladolid - Faculty of Medicine, University of Valladolid - Emergency Department, Emergency Medical Services (SACYL) - Advanced Life Support, Hospital Clínico Universitario Valladolid - Emergency Department, Servicio de Asistencia Municipal de Urgencia y Rescate (SAMUR-Protección Civil), Government of the Community of Madrid - Pneumology Service, University of Castilla-La Mancha - Faculty of Health Sciences, Universidad Autónoma de Madrid - Hospital Universitario de La Princesa and University of Valladolid - Faculty of Medicine