1. Emergency Department, Guy’s and St Thomas’ NHS Foundation Trust and King’s Health Partners, Westminster Bridge Road, London SE1 7EH
2. Clinical Toxicology Department, Guy’s and St Thomas’ NHS Foundation Trust and King’s Health Partners, Westminster Bridge Road, London SE1 7EH
3. Division of Health and Social Care Research, King’s College London, Faculty of Life Sciences and Medicine, Great Maze Pond, London SE1 9RT, UK