title: The effect of the doughnut hole.
authors.forename: Pete
authors.initials: P
authors.lastname: Penna
mesh_terms: D011307:Drug Prescriptions / Q000191:economics*; D004363:Drug Utilization; D005382:Financing, Personal / Q000191:economics* / Q000331:legislation & jurisprudence; D005102:Health Expenditures; D006801:Humans; D008329:Managed Care Programs / Q000458:organization & administration*; D054524:Medicare Part D / Q000331:legislation & jurisprudence*; D010593:Pharmaceutical Services / Q000191:economics / Q000331:legislation & jurisprudence*; D014481:United States