[1] Univ Hosp Henri Mondor, Med Intens Care Unit, F-94000 Creteil, France
[2] Univ Colorado, Hlth Sci Ctr, Dept Med, Div Pulm & Crit Care Med, Denver, CO 80262 USA
[3] Western Gen Hosp, Intens Care Unit, Edinburgh EH4 2XU, Midlothian, Scotland
[4] Policlin Univ, Dept Intens Care & Anesthesiol, Rome, Italy
[5] Royal Perth Hosp, Intens Care Unit, Perth, WA, Australia
[6] Univ European Hosp Georges Pompidou, Med Intens Care Unit, Paris, France
[7] Free Univ Amsterdam Hosp, Med Intens Care Unit, Amsterdam, Netherlands
[8] Hosp Sant Pau, Serv Med Intens, Barcelona, Spain
[9] Univ Hosp Vienna, Dept Anesthesia & Gen Intens Care Med, Vienna, Austria
[10] Fdn S Maugeri, Resp Intens Care Unit, Pavia, Italy
[11] Univ Pittsburgh, Med Ctr, Pittsburgh, PA USA
[12] Univ Med Sch Ulm, Dept Anesthesia, Ulm, Germany
[13] Univ Turin, Osped S Giovanni Battista, Turin, Italy
[14] Univ Hosp Bicetre, Intens Care Unit, Le Kremlin Bicetre, France
[15] Univ Cambridge, Sch Med, Addenbrookes Hosp, Dept Paediat, Cambridge, England
[16] Univ Hosp Lille, Dept Anesthesiol & Intens Care, Lille, France