1 Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Institute of Prehospital Care, London's Air Ambulance, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK.
2 Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Institute of Prehospital Care, London's Air Ambulance, London, UK.