[1] Guys & St Thomas Hosp, Dept Intens Care, London, England
[2] Cleveland Clin London, Dept Crit Care, London, England
[3] Kings Coll London, Fac Life Sci & Med, London, England
[4] Univ Southampton, Univ Hosp Southampton, NIHR Southampton Biomed Res Ctr, Southampton, England
[5] Providence Anesthesiol Associates, Clin & Qual Outcomes, Charlotte, NC USA
[6] Thomas Jefferson Univ Hosp, Sidney Kimmel Med Coll, Dept Anesthesiol & Perioperat Med, Philadelphia, PA USA
[7] Cleveland Clin, Dept Intens Care & Resuscitat, Cleveland, OH USA
[8] Univ Hosp Munster, Dept Anesthesiol Intens Care & Pain Med, Munster, Germany