title: Who Needs XR, LA, SR, XL, ER, or CR?
authors.forename: Frederic R
authors.initials: FR
authors.lastname: Curtiss
mesh_terms: D003365:Costs and Cost Analysis; D003692:Delayed-Action Preparations / Q000191:economics*; D016527:Drug Costs; D004345:Drug Industry / Q000191:economics; D016568:Drugs, Generic / Q000191:economics; D004465:Economic Competition; D006801:Humans; D008329:Managed Care Programs; D010330:Patents as Topic; D014481:United States
chemical_list: D003692:Delayed-Action Preparations; D016568:Drugs, Generic