[1] Univ Warwick, Warwick Med Sch, Coventry CV4 7AL, W Midlands, England
[2] Royal United Hosp, Bath BA1 3NG, Avon, England
[3] Fdn Policlin Univ A Gemelli IRCCS, Dept Intens Care Emergency Med & Anaesthesiol, Rome, Italy
[4] Univ Cattolica Sacro Cuore, Inst Anaesthesiol & Intens Care Med, Rome, Italy
[5] Univ Hosp Cologne, Dept Anaesthesiol & Intens Care Med, Kerpener Str 62, D-50937 Cologne, Germany
[6] Cochin Univ Hosp APHP, Paris, France
[7] Univ Paris Med Sch, Paris, France
[8] Lund Univ, Skane Univ Hosp, Dept Clin Sci, Neurol, Lund, Sweden
[9] Lund Univ, Skane Univ Hosp, Dept Clin Sci Anaesthesia & Intens Care Med, Lund, Sweden
[10] Catholic Univ Louvain, Acute Med Res Pole, Inst Expt & Clin Res IREC, Brussels, Belgium
[11] St Luc Univ Hosp, Emergency Dept, Brussels, Belgium
[12] Univ Warwick, Warwick Res Nursing, Div Hlth Sci, Warwick Med Sch, Room A108, Coventry CV4 7AL, W Midlands, England
[13] Lund Univ, Skane Univ Hosp, Dept Clin Sci Lund, Neurol, Lund, Sweden
[14] Univ Groningen, Univ Med Ctr Groningen, Dept Rehabil Med, Groningen, Netherlands
[15] Konstantopouleio Gen Hosp, Dept Cardiol, Athens, Greece
[16] Univ Oslo, Oslo Univ Hosp, Dept Anesthesiol, Oslo, Norway
[17] Univ Oslo, Inst Clin Med, Oslo, Norway
[18] Univ Helsinki, Dept Emergency Care & Serv, Helsinki, Finland
[19] Helsinki Univ Hosp, Helsinki, Finland
[20] Univ Libre Bruxelles, Dept Intens Care, Hop Erasme, Route Lennik 808, B-1070 Brussels, Belgium
[21] North Bristol NHS Trust, Southmead Hosp, Bristol BS10 5NB, Avon, England