[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, Osped Maggiore Policlin, 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] Hadstock, Cambridge, England
[9] VA Negovsky Res Inst Gen Reanimatol, Fed Res & Clin Ctr Intens Care Med & Rehabilitol, Moscow, Russia
[10] Antwerp Univ Hosp, Dept Emergency Med, Antwerp, Belgium
[11] Univ Antwerp, Antwerp, Belgium
[12] European Univ Cyprus, Sch Med, Dept Med, Nicosia, Cyprus
[13] Univ Warwick, Warwick Med Sch, Warwick Clin Trials Unit, Coventry CV4 7AL, W Midlands, England
[14] West Midlands Ambulance Serv & Midlands Air Ambul, Brierly Hill, West Midlands DY5 1LX, England
[15] North Bristol NHS Trust, Southmead Hosp, Bristol, Avon, England
[16] Akureyri Hosp, Akureyri, Iceland
[17] Univ Akureyri, Inst Hlth Sci Res, Akureyri, Iceland
[18] Univ Hosp Birmingham, Birmingham B9 5SS, W Midlands, England