[1] St James Hosp, Multidisciplinary Intens Care Res Org MICRO, Dept Intens Care Med, St Jamess St, Dublin, Ireland
[2] Trinity Coll Dublin, Dublin, Ireland
[3] Inst Hlth Carlos III, CIBER Resp Dis CIBERES, Madrid, Spain
[4] Univ Barcelona, Hosp Clin, Pulm Dept, IDIBAPS,ICREA, Barcelona, Spain