1. Department of Clinical Biochemistry, The Ipswich Hospital, Ipswich, United Kingdom
2. Department of Chemical Pathology, Addenbrooke’s Hospital, Cambridge, United Kingdom
3. The Medical Toxicology Unit Laboratory, Guy’s & St Thomas’ Hospital Trust, London, United Kingdom
4. Department of Chemical Pathology, Queen’s Hospital, Burton-on-Trent, United Kingdom
5. Department of Chemical Pathology, St Thomas’ Hospital, London, United Kingdom