1. National Poisons Information Service (Newcastle Unit), Regional Drug and Therapeutics Centre, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle, UK;
2. National Poisons Information Service (Edinburgh Unit), Royal Infirmary, Edinburgh, UK;
3. National Poisons Information Service (Cardiff Unit), University Hospital Llandough, Cardiff, UK;
4. National Poisons Information Service (Birmingham Unit), City Hospital, Birmingham, UK;
5. Medical Toxicology Centre, Institute of Cellular Medicine, Newcastle University, Newcastle, UK