1. Institute of Pharmaceutical Sciences, King’s College London , Stamford Street, London SE1 9NQ, UK
2. National Programme on Substance Abuse Deaths, King's College London , Stamford Street, London SE1 9NQ, UK
3. Toxicology Research Group, University of Hertfordshire , Hatfield AL10 9AB, UK
4. Forensic Pathology Services , Aspect House, The Quadrangle, Grove Business Park, Wantage OX12 9FA, UK