1. Emergency Department, St Georges University Hospital NHS Foundation Trust, London, UK
2. National Poisons Information Service, Cardiff Unit, University Hospital Llandough, Penarth, UK
3. National Poisons Information Service, Birmingham Unit, City Hospital, Birmingham, UK
4. National Poisons Information Service, Edinburgh Unit, Royal Infirmary of Edinburgh, Edinburgh, UK
5. National Poisons Information Service, Newcastle Unit, Newcastle upon Tyne Hospitals, Newcastle upon Tyne, UK
6. School of Medicine, Cardiff University, Cardiff, UK