1. Emergency Department, Hospital Universitario Rio Hortega, 47012 Valladolid, Spain
2. Faculty of Medicine, Universidad de Valladolid, 47003 Valladolid, Spain
3. Faculty of Health Sciences, Universidad de Castilla la Mancha, 45600 Talavera de la Reina, Spain
4. Advanced Life Support, Emergency Medical Services (SACYL), 47007 Valladolid, Spain
5. Emergency Department, Hospital Clínico Universitario, 47003 Valladolid, Spain
6. Department of Nursing, Faculty of Nursing, Universidad de Valladolid, 47003 Valladolid, Spain
7. Faculty of Nursing, Universidad of Castilla-La Mancha, 45004 Toledo, Spain