[1] Parc Tauli Hosp Universitari, Inst Recerca Part Tauli I3PT, Serv Med Intens, Parc Tauli 1, Sabadell 08028, Spain
[2] Univ Autonoma Barcelona, Dept Med, Bellaterra, Spain
[3] Univ Toronto, Interdept Div Crit Care Med, Toronto, ON, Canada
[4] Univ Hlth Network Toronto, Dept Med, Toronto, ON, Canada
[5] Toronto Gen Hosp Res Inst Toronto, Toronto, ON, Canada
[6] Univ Sao Paulo, Hosp Clin, Fac Med, Heart Inst Incor,Lab Pneumol LIM 09, Sao Paulo, Brazil