[1] Univ Cattolica Sacro Cuore, Policlin Univ A Gemelli, Dept Intens Care & Anesthesiol, I-00168 Rome, Italy
[2] Univ Med Ctr Utrecht, Julius Ctr Hlth Sci & Primary Care, Dept Med Microbiol, Utrecht, Netherlands
[3] Hop La Pitie Salpetriere, Paris, France
[4] Osped San Gerardo, Neurointens Care Unit, Monza, Italy
[5] Univ Washington, Div Pulm & Crit Care, Seattle, WA 98195 USA
[6] Free Univ Brussels, Erasme Hosp, Serv Soins Intensifs, B-1050 Brussels, Belgium
[7] Uppsala Univ, Dept Clin Physiol, Uppsala, Sweden
[8] Med Univ Innsbruck, Dept Internal Med, Innsbruck, Austria
[9] Royal Brompton Hosp, Pediat Intens Care Unit, London SW3 6LY, England
[10] Hosp Santa Creu & Sant Pau, Intens Care Med Unit, Barcelona, Spain
[11] Lariboisiere Hosp, Dept Anesthesiol & Crit Care Med, Paris, France
[12] Erasme Univ Hosp, Dept Intens Care, B-1070 Brussels, Belgium
[13] Ctr Ciencias Saude, Lab Pulm Invest, Rio De Janeiro, Brazil
[14] Hop A Michallon, Intens Care Med Unit, Grenoble, France
[15] Karolinska Univ Hosp, Dept Anesthesiol, Stockholm, Sweden
[16] Karolinska Univ Hosp, Dept Intens Care Med, Stockholm, Sweden
[17] Univ Toronto, Interdept Div Crit Care Med, Toronto, ON, Canada