[1] Univ Antwerp, B-2020 Antwerp, Belgium
[2] Univ Warwick, Warwick Med Sch, Coventry CV4 7AL, W Midlands, England
[3] Heart England NHS Fdn Trust, Crit Care Unit, Birmingham, W Midlands, England
[4] Univ Crete, European Soc Emergency Med EuSEM, Eth Comm, Sch Med, Iraklion, Greece
[5] Municipal Inst Emergency Med Novi Sad, Novi Sad, Serbia
[6] Univ Hosp Bern, Inselspital, Univ Klin Anasthesiol & Schmerztherapie, CH-3010 Bern, Switzerland
[7] Univ Bern, Bern, Switzerland
[8] Univ Warwick, Warwick Med Sch, Nursing Res Inst, Royal Coll, Coventry CV4 7AL, W Midlands, England
[9] Univ Athens, Sch Med, GR-11527 Athens, Greece
[10] Royal United Hosp, Dept Anaesthesia & Intens Care Med, Bath BA1 3NG, Avon, England
[11] Univ Hosp, Fed Dept Hlth, Ghent, Belgium
[12] Univ Ghent, B-9000 Ghent, Belgium
[13] Midwestern Univ, Chicago, IL USA