[1] Med Ctr Leeuwarden, Dept Intens Care, NL-8901 BR Leeuwarden, Netherlands
[2] Vejle Hosp, Dept Anaesthesiol & Intens Care, DK-7100 Vejle, Denmark
[3] Univ Southern, Inst Reg Hlth Res, DK-5000 Odense, Denmark
[4] Univ Washington, Harborview Med Ctr, Div Pulm & Crit Care, 325 9Th Ave, Seattle, WA 98104 USA
[5] Univ Washington, Cambia Palliat Care Ctr Excellence, Seattle, WA 98195 USA
[6] Gelre Hosp Apeldoorn, Dept Intens Care Med, Apeldoorn, Netherlands
[7] Univ Groningen, Univ Med Ctr Groningen, Dept Intens Care, NL-9713 GZ Groningen, Netherlands
[8] Univ Amsterdam, Acad Med Ctr, Dept Intens Care, Amsterdam, Netherlands