[1] Univ Oslo, Oslo Univ Hosp, Dept Anesthesiol, Oslo, Norway
[2] Univ Oslo, Inst Clin Med, Oslo, Norway
[3] Maggiore Hosp, Dept Anaesthesia Intens Care & Emergency Med Serv, Bologna, Italy
[4] Fdn IRCCS Ca Granda, Dept Anesthesiol Intens Care & Emergency, Milan, Italy
[5] Univ Milan, Dept Pathophysiol & Transplantat, Milan, Italy
[6] Univ Helsinki, Emergency Med, Helsinki, Finland
[7] Helsinki Univ Hosp, Dept Emergency Med & Serv, Helsinki, Finland
[8] VA Negovsky Res Inst Gen Reanimatol, Fed Res & Clin Ctr Intens Care Med & Rehabilitol, Moscow, Russia
[9] Antwerp Univ Hosp, Dept Emergency Med, Antwerp, Belgium
[10] Univ Antwerp, Antwerp, Belgium
[11] European Univ Cyprus, Sch Med, Dept Med, Nikosia, Cyprus
[12] Univ Warwick, Warwick Med Sch, Warwick Clin Trials Unit, Coventry, W Midlands, England
[13] West Midlands Ambulance Serv, Brierley Hill, England
[14] North Bristol NHS Trust, Southmead Hosp, Bristol, Avon, England
[15] Akureyri Hosp, Akureyri, Iceland
[16] Univ Akureyri, Inst Hlth Sci Res, Akureyri, Iceland
[17] Univ Hosp Birmingham, Birmingham, W Midlands, England