Access to Medicare Part D gap coverage more scarce in 2007.
D000368:Aged; D011307:Drug Prescriptions / Q000191:economics; D006801:Humans; D007342:Insurance Benefits / Q000191:economics / Q000331:legislation & jurisprudence*; D017054:Insurance, Medigap / Q000191:economics*; D007356:Insurance, Pharmaceutical Services / Q000191:economics / Q000331:legislation & jurisprudence*; D006278:Medicare / Q000191:economics / Q000331:legislation & jurisprudence*; D011306:Prescription Fees / Q000639:trends; D014481:United States