title: Letter: Methadone maintenance.
mesh_terms: D006801:Humans; D007880:Legislation, Drug; D008691:Methadone / Q000008:administration & dosage*; D013375:Substance Withdrawal Syndrome / Q000517:prevention & control; D019966:Substance-Related Disorders / Q000188:drug therapy*; D014481:United States
chemical_list: D008691:Methadone