1 Paediatric Emergency Medicine Department, Imperial College Healthcare NHS Trust and BRC Imperial NIHR, Imperial College, London, UK. Electronic address: i.maconochie@imperial.ac.uk.
2 Department of Paediatric Anaesthesia, Great Ormond Street Hospital for Children, London, UK.
3 Department of Anaesthesia, Paediatric Intensive Care and Emergency Medicine, Auf der Bult Children's Hospital, Hannover, Germany.
4 Paediatric Intensive Care Department, Hospital General Universitario Gregorio Marañón, Medical School, Complutense University of Madrid, Madrid, Spain.
5 Paediatric Emergency and Critical Care Division, Paediatric Area Hospital Clinico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.
6 Paediatric Intensive Care Department, Womens and Childrens Division, Oslo University Hospital, Ulleval, Oslo, Norway.
7 Paediatric Intensive Care and Emergency Medicine Departments, University Hospital Ghent and Ghent University, EMS Dispatch 112 Eastern Flanders, Federal Department Health Belgium, Ghent, Belgium.
8 Anaesthesia Department, Imperial College Healthcare NHS Trust, London, UK.
9 Paediatric Intensive Care and Emergency Medicine Departments, Universite Libre de Bruxelles, Hôpital Universitaire des Enfants, Brussels, Belgium.
10 Emergency Medicine, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium and Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium.
11 Anaesthesia and Intensive Care Medicine, Royal United Hospital, Bath, UK and University of Bristol, UK.