1 Clinic University Hospital of Valladolid, Anesthesiology and Critical Care Department, Valladolid, Spain; Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain. Electronic address: pablojor@yahoo.es.
2 Clinic University Hospital of Valladolid, Anesthesiology and Critical Care Department, Valladolid, Spain.
3 Clinic University Hospital of Valladolid, Anesthesiology and Critical Care Department, Valladolid, Spain; Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain.