[1] CHU Lisboa Cent, Hosp Sao Jose, Nova Med Sch, Fac Ciencias Med Lisboa, Lisbon, Portugal
[2] Univ Beira Interior, Fac Ciencias Saude, Covilha, Portugal
[3] St Georges Univ London, St Georges Univ Hosp NHS Fdn Trust, London, England
[4] Lausanne Univ Hosp, Adult Intens Care Unit, Lausanne, Switzerland
[5] Univ Lausanne, Lausanne, Switzerland
[6] Pontificia Univ Catolica Chile, Fac Med, Dept Med Intens, Santiago, Chile
[7] Univ Bern, Dept Intens Care Med, Univ Hosp Bern, Bern, Switzerland
[8] Univ Miami, Miller Sch Med, Div Pulm Crit Care & Sleep Med, Miami, FL 33136 USA
[9] CHU Porto, Hosp Santo Antonio, Dept Anesthesiol Crit Care & Emergency Med, Porto, Portugal
[10] Emory Crit Care Ctr, Dept Surg, Atlanta, GA 30322 USA
[11] Tata Mem Hosp, Homi Bhabha Natl Inst, Dept Anaesthesiol Crit Care & Pain, Mumbai, Maharashtra, India
[12] UCL, Bloomsbury Inst Intens Care Med, Div Med, London, England
[13] Hosp Servidor Publ Estadual Francisco Morato O, Sao Paulo, SP, Brazil
[14] Univ Michigan, Dept Med, Ann Arbor, MI USA
[15] DOr Inst Res & Educ IDOR, Dept Crit Care, Rio De Janeiro, Brazil
[16] Hop Xavier Bichat, AP HP, Med & Infect Dis Intens Care Unit MI2, Paris, France
[17] Univ Utrecht, Univ Med Ctr Utrecht, Dept Intens Care Med, Utrecht, Netherlands
[18] Heinrich Heine Univ Dusseldorf, Univ Hosp Dusseldorf, Fac Med, Div Cardiol Pulmonol & Vasc Med, D-40225 Dusseldorf, Germany
[19] Ghent Univ Hosp, Dept Crit Care Med, Ghent, Belgium
[20] Emory Univ, Div Pulm Allergy Crit Care & Sleep Med, Dept Med, Atlanta, GA USA
[21] Grady Mem Hosp, Atlanta, GA USA
[22] Univ Cambridge, Heart & Lung Res Inst, Cambridge, England
[23] Famirea Study Grp, Med Intens Care Unit, Paris, France
[24] Jikei Univ Hosp, Intens Care Unit, Tokyo, Japan
[25] Nepean Hosp, Dept Intens Care Med, Kingswood, NSW, Australia
[26] Univ Libre Bruxelles, Erasme Hosp, Dept Intens Care, B-1070 Brussels, Belgium
[27] VA Ctr Clin Management Res, HSR&D Ctr Innovat, Ann Arbor, MI 48105 USA