[1] Univ Montpellier, St Eloi Teaching Hosp, Anesthesia & Crit Care Dept B, PhyMedExp,INSERM U1046,CNRS UMR 9214,Anesthesiol, F-34295 Montpellier 5, France
[2] Ctr Hosp Univ Montpellier, F-34295 Montpellier, France
[3] Hosp Univ Vall dHebron, Inst Recerca Vall dHebron, Serv Med Intens, Barcelona, Spain
[4] Univ Autonoma Barcelona, Dept Med, Bellaterra, Spain
[5] Inst Salud Carlos III, Ciber Enfermedades Resp Ciberes, Madrid, Spain
[6] Hop Edouard Herriot, Grp Hosp Lyon Ctr, Med Intens Reanimat, 5 Pl Arsonval, F-69003 Lyon, France
[7] Univ Lyon, Lyon, France
[8] INSERM 955, Inst Mondor Rech Biomed, Creteil, France