Affiliation: | 1. Department of Neurosurgery, Queen's Hospital, Barking, Havering and Redbridge NHS Trust, Romford, Essex;2. Department of Emergency Medicine, Bart's Health NHS Trust, London, UK;3. Department of Emergency Medicine, St. Thomas Hospital, London, UK;4. Department of Pathology, Queen's Hospital, Barking, Havering and Redbridge NHS Trust, Romford, Essex;5. Department of Biochemistry, Royal London Hospital, London, UK;6. Department of Emergency Medicine, Queen Mary University of London, London, UK |