[1] Gelre Hosp, Intens Care Dept, Albert Schweitzerlaan 31, NL-7334 DZ Apeldoorn, Netherlands
[2] Expertise Ctr Intens Care Rehabil Apeldoorn ExpIR, Apeldoorn, Netherlands
[3] Univ Copenhagen, Rigshosp, Intens Care Unit, Copenhagen, Denmark
[4] Univ Copenhagen, Hlth & Med Sci, Copenhagen, Denmark
[5] Queens Univ Belfast, Sch Nursing & Midwifery, Belfast, Antrim, North Ireland
[6] St Georges Univ London, Ctr Allied Hlth, London, England
[7] Kings Coll London, Florence Nightingale Fac Nursing Midwifery & Pall, London, England
[8] Johns Hopkins Univ, Dept Phys Med & Rehabil, Baltimore, MD USA
[9] Johns Hopkins Univ, Div Pulm & Crit Care Med, Baltimore, MD USA
[10] Johns Hopkins Univ, Outcomes Crit Illness & Surg Res Grp, Baltimore, MD USA