title: Classification and confusion.
authors.affiliation: Reader in Addiction Psychiatry, Kings College London, London, UK. michael.farrell@kcl.ac.uk
authors.forename: Michael
authors.initials: M
authors.lastname: Farrell
mesh_terms: D006801:Humans; D013287:Illicit Drugs / Q000009:adverse effects / Q000145:classification*
chemical_list: D013287:Illicit Drugs