[1] Univ Hosp Cologne, Dept Anaesthesiol & Intens Care Med, Cologne, Germany
[2] Calderdale Royal Hosp, Emergency Dept, Halifax, England
[3] Amer Med Ctr, Nicosia, Cyprus
[4] Univ Bern, Bern Univ Hosp, Dept Anesthesiol & Pain Therapy, Bern, Switzerland
[5] Sigmund Freud Univ Vienna, Sch Med, Vienna, Austria
[6] Antwerp Univ Hosp, Emergency Dept, Edegem, Belgium
[7] Univ Ghent, Fac Med & Hlth Sci, Ghent, Belgium
[8] St Lucas Gen Hosp, Dept Emergency Med, Ghent, Belgium
[9] Konstantopouleio Gen Hosp, Dept Cardiol & Cardiac Intens Care, Athens, Greece
[10] Univ Warwick, Warwick Clin Trials Unit, Bath, Avon, England
[11] Royal United Hosp, Dept Anaesthesia & Intens Care Med, Bath, Avon, England
[12] Univ Warwick, Warwick Clin Trials Unit, Coventry, W Midlands, England
[13] Univ Warwick, Univ Hosp Birmingham NHS Fdn Trust, Coventry, W Midlands, England
[14] Maggiore Hosp, Dept Anaesthesia Intens Care & EMS, Bologna, Italy