[1] Hosp Univ Getafe, Crit Care Dept, Madrid, Spain
[2] CIBER Enfermedades Resp CIBERES, Madrid, Spain
[3] Hosp Univ Getafe, Dept Microbiol, Madrid, Spain
[4] Hosp Univ Getafe, Dept Nephrol, Madrid, Spain
[5] Univ Liverpool, Inst Ageing & Chron Dis, Liverpool, Merseyside, England
[6] Univ Europea, Madrid, Spain