title: Letter: Methadone maintenance.
mesh_terms: D006801:Humans; D007880:Legislation, Drug; D008691:Methadone / Q000627:therapeutic use*; D009021:Morphine Dependence / Q000188:drug therapy*; D013375:Substance Withdrawal Syndrome / Q000517:prevention & control; D014481:United States
chemical_list: D008691:Methadone