title: Looking at the doughnut hole in health insurance.
authors: Isaac
authors: I
authors: Sorkin
mesh_terms: D000368:Aged; D017047:Cost Sharing; D016527:Drug Costs; D005382:Financing, Personal; D005102:Health Expenditures; D006801:Humans; D007356:Insurance, Pharmaceutical Services; D006278:Medicare; D014481:United States