title: Substitution therapy service provision into older age.
authors.forename: Robert
authors.initials: R
authors.lastname: Verity
mesh_terms: D000328:Adult; D003695:Delivery of Health Care / Q000592:standards; D004335:Drug and Narcotic Control / Q000191:economics; D004739:England; D005260:Female; D006556:Heroin Dependence / Q000534:rehabilitation*; D006801:Humans; D008297:Male; D008875:Middle Aged