1 Pharmacology, Therapeutics and Toxicology, Centre for Cardiovascular Science, University of Edinburgh, The Queen's Medical Research Institute, Edinburgh, UK.
2 Clinical Toxicology, Guy's and St Thomas' NHS Foundation Trust, London, UK.
3 Clinical Toxicology, Faculty of Life Sciences and Medicine, King's College London, London, UK.
4 Division of Clinical Pharmacology and Toxicology, Departments of Medicine and Pediatrics, University of Toronto, Toronto, Canada.
5 National Poisons Information Service (Newcastle unit), Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle-upon-Tyne, UK.