title: Attitudes and beliefs of clients toward methadone prior to and during treatment.
mesh_terms: D001294:Attitude to Health; D004219:District of Columbia; D006556:Heroin Dependence / Q000188:drug therapy*; D006801:Humans; D007406:Interview, Psychological; D008691:Methadone / Q000627:therapeutic use*; D012659:Semantic Differential
chemical_list: D008691:Methadone