title: Heroin maintenance clinics. A discussion of the U.S. addiction treatment and the "British System".
mesh_terms: D003153:Community Health Services; D011307:Drug Prescriptions; D003932:Heroin / Q000627:therapeutic use*; D006556:Heroin Dependence / Q000188:drug therapy*; D006801:Humans; D008131:London; D008691:Methadone / Q000627:therapeutic use*; D006113:United Kingdom; D014481:United States
chemical_list: D003932:Heroin; D008691:Methadone