1 Bioaraba, Intensive Care Unit, Vitoria-Gasteiz, Spain; Osakidetza Basque Health Service, Araba University Hospital, Intensive Care Unit, Vitoria-Gasteiz, Spain. Electronic address: helena.barrasagonzalez@osakidetza.eus.
2 Bioaraba, Intensive Care Unit, Vitoria-Gasteiz, Spain; Osakidetza Basque Health Service, Araba University Hospital, Intensive Care Unit, Vitoria-Gasteiz, Spain.
3 Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Instituto Salud Carlos III, Madrid, Spain; Clinical Research in Pneumonia & Sepsis (CRIPS), Vall d'Hebron Institute of Research, Barcelona, Spain.
4 Bioaraba, Clinical Microbiology, Vitoria-Gasteiz, Spain; Osakidetza Basque Health Service, Araba University Hospital, Service of Microbiology, Vitoria-Gasteiz, Spain.