[1] North Bristol NHS Trust, Southmead Hosp, Bristol, Avon, England
[2] Univ Hosp Cologne, Dept Anaesthesiol & Intens Care Med, Cologne, Germany
[3] Ctr Hosp Univ Necker Enfants Malad, AP HP, SAMU Paris, Paris, France
[4] Univ Paris 05, Paris, France
[5] Univ Hosp Birmingham NHS Fdn Trust, Crit Care Unit, Birmingham, W Midlands, England
[6] Univ Warwick, Warwick Med Sch, Coventry, W Midlands, England
[7] Univ Hosp Southampton NHS Fdn Trust, Southampton, Hants, England
[8] South Cent Ambulance Serv NHS Fdn Trust, Otterbourne, England
[9] Karolinska Univ Hosp, Dept Acute & Reparat Med, Stockholm, Sweden
[10] Karolinska Inst, Dept Med Solna, Stockholm, Sweden
[11] Johannes Gutenberg Univ Mainz, Univ Med Ctr, Dept Anesthesiol, Mainz, Germany
[12] Univ Oslo, Oslo Univ Hosp, Dept Anesthesiol, Oslo, Norway
[13] Univ Oslo, Inst Clin Med, Oslo, Norway
[14] Paracelsus Med Univ, Hosp Bros Hosp, Dept Anaesthesiol & Intens Care Med, Salzburg, Austria
[15] Azienda Sanitaria Friuli Occident, Dept Anaesthesia & Intens Care, Pordenone Pn, Italy
[16] Univ Hosp Birmingham NHS Fdn Trust, Coventry, W Midlands, England
[17] Fdn Policlin Univ A Gemelli IRCCS, Dept Intens Care Emergency Med & Anaesthesiol, Rome, Italy
[18] Univ Cattolica Sacro Cuore, Inst Anaesthesiol & Intens Care Med, Rome, Italy
[19] Royal United Hosp, Bath, Avon, England