[1] St James Hosp, Dept Anaesthesia & Crit Care Med, Dublin, Ireland
[2] Ctr Hosp Lisboa Ocidental, Hosp Sao Francisco Xavier, Polyvalent Intens Care Unit, Lisbon, Portugal
[3] Univ Nova Lisboa, NOVA Med Sch, Lisbon, Portugal
[4] CHU Lille, Ctr Reanimat, Lille, France
[5] Lille Univ, Med Sch, Lille, France
[6] Hosp Univ Tarragona Joan XXIII, Crit Care Dept, URV, IISPV,CIBERES, Tarragona, Spain
[7] Hosp Clin Barcelona, IDIBAPS, Resp Inst, Pulm Intens Care Unit, Barcelona, Spain
[8] St James Hosp, MICRO, Dublin, Ireland