1 Warwick Medical School, University of Warwick, Coventry, UK; Critical Care Unit, Heart of England NHS Foundation Trust, Birmingham, UK. Electronic address: g.d.perkins@warwick.ac.uk.
2 Hadstock, Cambridge, UK.
3 Department of Cardiology, Academic Medical Center, Amsterdam, The Netherlands.
4 Department of Emergency Medicine and Services, Helsinki University Hospital and Helsinki University, Finland.
5 Warwick Medical School, University of Warwick, Coventry, UK; West Midlands Ambulance Service NHS Foundation Trust, Dudley, UK.
6 Norwegian National Advisory Unit on Prehospital Emergency Medicine and Department of Anesthesiology, Oslo University Hospital, Oslo, Norway.
7 Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium; Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium.
8 Municipal Institute for Emergency Medicine Novi Sad, Novi Sad, Serbia.
9 Department of Anaesthesia and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Kiel, Germany.
10 Department of Anesthesiology and Critical Care Medicine, Medical University of Innsbruck, Innsbruck, Austria.
11 Department of Cardiovascular Research, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", Milan, Italy.
12 Anaesthesia and Intensive Care Medicine, Southmead Hospital, Bristol, UK.
13 University of Antwerp, Antwerp, Belgium.
14 Emergency Department, Hospital Universitario Virgen del Rocío, Sevilla, Spain.
15 Global First Aid Reference Centre, International Federation of Red Cross and Red Crescent, Paris, France.
16 Emergency and Intensive Care Department, Hospital de Faro, Centro Hospitalar do Algarve, Porto, Portugal.
17 Department of Anaesthesiology and Intensive Care, Catholic University School of Medicine, Rome, Italy.
18 Imperial College Healthcare NHS Trust, London, UK.
19 Department of Anaesthesia and Intensive Care Medicine, Royal United Hospital, Bath, UK.
20 Paediatric Emergency Medicine and NIHR BRC, Imperial College, London, UK.
21 Department of Anaesthesiology and Pain Medicine, University Hospital Bern and University Bern, Bern, Switzerland.